diff --git a/src/hooks/useAsync.ts b/src/hooks/useAsync.ts
index 23499ef..73f0d0c 100644
--- a/src/hooks/useAsync.ts
+++ b/src/hooks/useAsync.ts
@@ -1,12 +1,44 @@
+/**
+ * Custom Hook for Async Operations
+ * Provides a reusable pattern for handling asynchronous operations with loading, error, and data states
+ */
+
 import { useState, useCallback } from 'react';
 import { handleError } from '../utils/errorHandling';
 
+/**
+ * State interface for async operations
+ * @template T - The type of data returned by the async operation
+ */
 interface AsyncState<T> {
+  /** The data returned from the async operation, null if not yet loaded or error occurred */
   data: T | null;
+  /** Error object if the operation failed, null otherwise */
   error: Error | null;
+  /** Loading state indicator, true while operation is in progress */
   loading: boolean;
 }
 
+/**
+ * Custom hook for managing asynchronous operations
+ * Handles loading states, error handling, and data management for async functions
+ *
+ * @template T - The type of data returned by the async operation
+ * @returns Object containing:
+ *   - data: The result of the async operation or null
+ *   - error: Any error that occurred or null
+ *   - loading: Boolean indicating if operation is in progress
+ *   - execute: Function to trigger the async operation
+ *
+ * @example
+ * ```tsx
+ * const { data, error, loading, execute } = useAsync<User>();
+ *
+ * useEffect(() => {
+ *   execute(() => fetchUser(userId));
+ * }, [userId]);
+ * ```
+ */
 export function useAsync<T>() {
   const [state, setState] = useState<AsyncState<T>>({
     data: null,
diff --git a/src/hooks/useOnClickOutside.ts b/src/hooks/useOnClickOutside.ts
index dbd277b..555a81d 100644
--- a/src/hooks/useOnClickOutside.ts
+++ b/src/hooks/useOnClickOutside.ts
@@ -1,5 +1,21 @@
+/**
+ * Click Outside Detection Hook
+ * Detects clicks outside of a referenced element and triggers a handler
+ */
+
 import { RefObject, useEffect } from 'react';
 
+/**
+ * Hook that triggers a handler when user clicks outside the referenced element
+ * Useful for closing dropdowns, modals, or menus when clicking outside
+ *
+ * @param ref - React ref object pointing to the element to monitor
+ * @param handler - Callback function to execute when click occurs outside the element
+ *
+ * @example
+ * const menuRef = useRef<HTMLDivElement>(null);
+ * useOnClickOutside(menuRef, () => setMenuOpen(false));
+ */
 export function useOnClickOutside(ref: RefObject<HTMLElement>, handler: (event: MouseEvent | TouchEvent) => void) {
   useEffect(() => {
     const listener = (event: MouseEvent | TouchEvent) => {
diff --git a/src/hooks/useProjectData.ts b/src/hooks/useProjectData.ts
index f1849ef..3bb704e 100644
--- a/src/hooks/useProjectData.ts
+++ b/src/hooks/useProjectData.ts
@@ -1,7 +1,18 @@
-// src/hooks/useProjectData.ts
+/**
+ * Project Data Hook
+ * Custom hook for dynamically loading project data based on current language
+ */
+
 import { useTranslation } from 'react-i18next';
 import { useState, useEffect } from 'react';
 
+/**
+ * Loads project data dynamically based on project ID and current language
+ *
+ * @template T - The type of the project data object
+ * @param {string} projectId - The unique identifier of the project
+ * @returns {T | null} The project data object or null if loading fails
+ */
 export const useProjectData = <T = unknown>(projectId: string): T | null => {
     const { i18n } = useTranslation();
     const [projectData, setProjectData] = useState<T | null>(null);
diff --git a/src/hooks/useScrollLock.ts b/src/hooks/useScrollLock.ts
index d790af5..4ff48ca 100644
--- a/src/hooks/useScrollLock.ts
+++ b/src/hooks/useScrollLock.ts
@@ -1,8 +1,18 @@
+/**
+ * Scroll Lock Hook
+ * Manages body scroll locking based on state and navigation transitions
+ */
+
 // hooks/useScrollLock.ts
 import { useEffect } from 'react';
 import { useLocation } from 'react-router-dom';
 import { useScrollContext } from '../components/ScrollContext';
 
+/**
+ * Custom hook to lock/unlock page scrolling
+ * Automatically handles scroll restoration on route changes and cleanup on unmount
+ * @param lock - Whether to lock the page scroll
+ */
 export const useScrollLock = (lock: boolean) => {
     const location = useLocation();
     const { isTransitioning, lockScroll, unlockScroll } = useScrollContext();
diff --git a/src/hooks/useScrollTracking.ts b/src/hooks/useScrollTracking.ts
index 8eebbc7..d024bba 100644
--- a/src/hooks/useScrollTracking.ts
+++ b/src/hooks/useScrollTracking.ts
@@ -1,8 +1,37 @@
+/**
+ * Scroll Tracking Hook
+ * Tracks user scroll depth and sends events to Google Tag Manager
+ */
+
 import { useEffect, useRef } from 'react';
 import { trackScrollDepth } from '../services/gtm';
 
 /**
- * Hook to track scroll depth for GTM
+ * Custom hook to track scroll depth for GTM analytics
+ *
+ * Monitors user scroll behavior and triggers GTM events when the user reaches
+ * specific depth milestones (25%, 50%, 75%, 90%, 100%). Each milestone is
+ * tracked only once per page visit to avoid duplicate events.
+ *
+ * Features:
+ * - Debounced scroll event handling (100ms) for performance
+ * - Tracks depth milestones: 25%, 50%, 75%, 90%, 100%
+ * - Prevents duplicate tracking of the same milestone
+ * - Automatically resets tracking state on route changes
+ * - Checks initial scroll position on mount
+ *
+ * @example
+ * ```tsx
+ * function MyPage() {
+ *   useScrollTracking();
+ *   return <div>...</div>;
+ * }
+ * ```
+ *
+ * @remarks
+ * This hook should be used at the page/route level component to ensure
+ * accurate tracking across navigation. The tracking state is automatically
+ * reset when the URL pathname changes.
  */
 export const useScrollTracking = () => {
   const trackedDepths = useRef(new Set<number>());
diff --git a/src/lib/blog.ts b/src/lib/blog.ts
index cafe5f9..ec45c80 100644
--- a/src/lib/blog.ts
+++ b/src/lib/blog.ts
@@ -1,21 +1,42 @@
+/**
+ * Blog Post Management Service
+ * Zentrale Verwaltung aller Blog-Beiträge mit automatischer Kategorie-Erkennung
+ */
+
 import fs from 'fs';
 import path from 'path';
 import { cache } from '@/utils/cache';
 
+/**
+ * Blog Post Interface
+ * Definiert die Struktur eines Blog-Beitrags
+ */
 export interface BlogPost {
+  /** URL-freundlicher Slug */
   slug: string;
+  /** Titel des Beitrags */
   title: string;
+  /** Veröffentlichungsdatum (ISO 8601) */
   date: string;
+  /** Kurze Zusammenfassung */
   excerpt: string;
+  /** Pfad zum Cover-Bild */
   coverImage: string;
+  /** Kategorie des Beitrags */
   category?: string;
+  /** Schlagwörter/Tags */
   tags?: string[];
+  /** Vollständiger Markdown-Inhalt */
   content?: string;
 }
 
+// Verzeichnis der Blog-Beiträge
 const BLOG_POSTS_DIR = path.join(process.cwd(), 'blog-posts');
 
-// Category mapping based on filename patterns
+/**
+ * Kategorie-Mapping basierend auf Dateinamen- und Inhaltsmustern
+ * Ordnet Keywords automatisch passenden Kategorien zu
+ */
 const categoryMap: Record<string, string> = {
   'agentic': 'KI-Agenten',
   'ai-agent': 'KI-Agenten',
@@ -59,6 +80,13 @@ const categoryMap: Record<string, string> = {
   'home-assistant': 'Smart Home',
 };
 
+/**
+ * Erkennt automatisch die Kategorie eines Blog-Posts
+ * Analysiert Dateiname und Inhalt auf Keywords
+ * @param filename - Dateiname des Blog-Posts
+ * @param content - Inhalt des Blog-Posts
+ * @returns Die erkannte Kategorie oder 'Technologie' als Fallback
+ */
 function detectCategory(filename: string, content: string): string {
   const lowerFilename = filename.toLowerCase();
   const lowerContent = content.toLowerCase().slice(0, 500);
@@ -71,6 +99,13 @@ function detectCategory(filename: string, content: string): string {
   return 'Technologie';
 }
 
+/**
+ * Parst einen Markdown-Blog-Post und extrahiert alle Metadaten
+ * Extrahiert Titel, Meta-Description, Keywords, Kategorie und generiert Slug
+ * @param filename - Dateiname des Markdown-Posts
+ * @param content - Vollständiger Markdown-Inhalt
+ * @returns BlogPost-Objekt oder null bei Fehler
+ */
 function parseMarkdownPost(filename: string, content: string): BlogPost | null {
   try {
     // Extract title from first H1
@@ -130,6 +165,11 @@ function parseMarkdownPost(filename: string, content: string): BlogPost | null {
   }
 }
 
+/**
+ * Lädt alle Blog-Posts aus dem Dateisystem
+ * Posts werden nach Datum absteigend sortiert (neueste zuerst)
+ * @returns Array aller Blog-Posts
+ */
 export function getAllBlogPosts(): BlogPost[] {
   const cacheKey = 'blog:all-posts';
 
@@ -174,11 +214,21 @@ export function getAllBlogPosts(): BlogPost[] {
   return sortedPosts;
 }
 
+/**
+ * Sucht einen Blog-Post anhand seines Slugs
+ * @param slug - Der URL-Slug des gesuchten Posts
+ * @returns Der gefundene Blog-Post oder null
+ */
 export function getBlogPostBySlug(slug: string): BlogPost | null {
   const posts = getAllBlogPosts();
   return posts.find(post => post.slug === slug) || null;
 }
 
+/**
+ * Gibt alle verfügbaren Blog-Post Slugs zurück
+ * Nützlich für statische Seitengenerierung
+ * @returns Array aller Post-Slugs
+ */
 export function getBlogPostSlugs(): string[] {
   return getAllBlogPosts().map(post => post.slug);
 }
diff --git a/src/lib/markdown.tsx b/src/lib/markdown.tsx
index 1ddde9d..1ff8f5c 100644
--- a/src/lib/markdown.tsx
+++ b/src/lib/markdown.tsx
@@ -1,5 +1,14 @@
+/**
+ * Markdown Rendering Utility
+ * Converts markdown text to styled React components
+ */
+
 import React from 'react';
 
+/**
+ * Parse inline markdown syntax (code, bold, italic, links)
+ * Converts inline markdown elements within a text string to React components
+ */
 function parseInlineMarkdown(text: string): React.ReactNode {
   const parts: React.ReactNode[] = [];
   let remaining = text;
@@ -63,6 +72,10 @@ function parseInlineMarkdown(text: string): React.ReactNode {
   return parts.length === 1 ? parts[0] : <>{parts}</>;
 }
 
+/**
+ * Render markdown content to React components
+ * Supports headers, lists, code blocks, tables, blockquotes, and inline formatting
+ */
 export function renderMarkdown(content: string): React.ReactNode {
   const lines = content.split('\n');
   const elements: React.ReactNode[] = [];
diff --git a/src/lib/supabase/client.ts b/src/lib/supabase/client.ts
index e6db2a1..71be730 100644
--- a/src/lib/supabase/client.ts
+++ b/src/lib/supabase/client.ts
@@ -1,5 +1,14 @@
+/**
+ * Supabase Browser Client
+ * Client-side Supabase client for authentication and database access
+ */
+
 import { createBrowserClient } from '@supabase/ssr';
 
+/**
+ * Creates a Supabase browser client instance
+ * @returns Supabase client configured with environment variables
+ */
 export function createClient() {
   return createBrowserClient(
     process.env.NEXT_PUBLIC_SUPABASE_URL!,
diff --git a/src/lib/supabase/server.ts b/src/lib/supabase/server.ts
index 7c29af0..6e300f9 100644
--- a/src/lib/supabase/server.ts
+++ b/src/lib/supabase/server.ts
@@ -1,6 +1,17 @@
+/**
+ * Supabase Server Client Utility
+ * Creates server-side Supabase clients with cookie handling for SSR
+ */
+
 import { createServerClient } from '@supabase/ssr';
 import { cookies } from 'next/headers';
 
+/**
+ * Creates a Supabase client for server-side usage
+ * Handles cookie management for authentication in Next.js server components
+ *
+ * @returns {Promise} Supabase server client instance
+ */
 export async function createClient() {
   const cookieStore = await cookies();
 
diff --git a/src/utils/analytics.ts b/src/utils/analytics.ts
index 6fa8535..4f268d8 100644
--- a/src/utils/analytics.ts
+++ b/src/utils/analytics.ts
@@ -1,9 +1,16 @@
+/**
+ * Analytics Service
+ * Zentrale Verwaltung von Google Analytics, Facebook Pixel und Cookie-basiertem Tracking
+ */
+
 import ReactGA from 'react-ga4';
 
 const TRACKING_ID = 'G-N0PZBL7X18';
 const FB_PIXEL_ID = 'XXXXXXXXXXXXXXXXX'; // Ersetze mit deiner Facebook Pixel ID
 
-// Prüft, ob eine bestimmte Cookie-Kategorie aktiviert ist
+/**
+ * Prüft, ob eine bestimmte Cookie-Kategorie aktiviert ist
+ */
 export const isCookieCategoryEnabled = (category: string): boolean => {
   try {
     const cookieSettings = localStorage.getItem('cookieSettings');
@@ -17,7 +24,9 @@ export const isCookieCategoryEnabled = (category: string): boolean => {
   }
 };
 
-// Entfernt alle Google Analytics Cookies
+/**
+ * Entfernt alle Google Analytics Cookies
+ */
 const removeGACookies = (): void => {
   const cookies = document.cookie.split(';');
   for (let i = 0; i < cookies.length; i++) {
@@ -33,7 +42,9 @@ const removeGACookies = (): void => {
   }
 };
 
-// Google Analytics Initialisierung - mit strikter Zustimmungsprüfung
+/**
+ * Initialisiert Google Analytics mit strikter Zustimmungsprüfung
+ */
 export const initGA = (): void => {
   if (!isCookieCategoryEnabled('analytics')) {
     // Entferne bestehende GA-Cookies, falls keine Zustimmung
@@ -49,6 +60,9 @@ export const initGA = (): void => {
   });
 };
 
+/**
+ * Loggt einen Seitenaufruf in Google Analytics
+ */
 export const logPageView = (): void => {
   if (!isCookieCategoryEnabled('analytics')) {
     return;
@@ -61,6 +75,9 @@ export const logPageView = (): void => {
   });
 };
 
+/**
+ * Trackt ein benutzerdefiniertes Event
+ */
 export const trackEvent = (category: string, action: string, label?: string): void => {
   if (!isCookieCategoryEnabled('analytics')) {
     return;
@@ -73,6 +90,9 @@ export const trackEvent = (category: string, action: string, label?: string): vo
   });
 };
 
+/**
+ * Trackt eine Conversion
+ */
 export const trackConversion = (value?: number): void => {
   if (!isCookieCategoryEnabled('analytics')) {
     return;
@@ -85,6 +105,9 @@ export const trackConversion = (value?: number): void => {
   });
 };
 
+/**
+ * Trackt Performance-Timing
+ */
 export const trackTiming = (category: string, variable: string, value: number): void => {
   if (!isCookieCategoryEnabled('analytics')) {
     return;
@@ -98,7 +121,9 @@ export const trackTiming = (category: string, variable: string, value: number):
   });
 };
 
-// Facebook Pixel Initialisierung - nur mit Zustimmung
+/**
+ * Initialisiert Facebook Pixel nur mit Zustimmung
+ */
 export const initFBPixel = (): void => {
   if (!isCookieCategoryEnabled('marketing')) {
     return;
@@ -122,7 +147,9 @@ export const initFBPixel = (): void => {
   }
 };
 
-// Facebook Event tracking
+/**
+ * Trackt Facebook Pixel Events
+ */
 export const trackFBEvent = (event: string, params?: Record<string, unknown>): void => {
   if (!isCookieCategoryEnabled('marketing') || typeof window === 'undefined' || !window.fbq) {
     return;
@@ -131,7 +158,9 @@ export const trackFBEvent = (event: string, params?: Record<string, unknown>): v
   window.fbq('track', event, params);
 };
 
-// Google Fonts Handling - nur mit funktionaler Cookie-Zustimmung
+/**
+ * Initialisiert Google Fonts nur mit funktionaler Cookie-Zustimmung
+ */
 export const initGoogleFonts = (): void => {
   if (!isCookieCategoryEnabled('functional')) {
     // Entferne bestehende Google Fonts
@@ -151,7 +180,9 @@ export const initGoogleFonts = (): void => {
   // Code hier zur lokalen Einbindung der Schriftarten
 };
 
-// Funktionale Cookies initialisieren
+/**
+ * Initialisiert funktionale Cookies und Services
+ */
 export const initFunctionalCookies = (): void => {
   if (!isCookieCategoryEnabled('functional')) {
     return;
diff --git a/src/utils/api.ts b/src/utils/api.ts
index 53326d6..b244e06 100644
--- a/src/utils/api.ts
+++ b/src/utils/api.ts
@@ -1,9 +1,25 @@
+/**
+ * API Utility Functions
+ * Provides enhanced fetch functionality with timeout support
+ */
+
 import { handleError, createAPIError } from './errorHandling';
 
+/**
+ * Extended request options with timeout support
+ */
 interface RequestOptions extends RequestInit {
+  /** Request timeout in milliseconds (default: 8000ms) */
   timeout?: number;
 }
 
+/**
+ * Fetch with automatic timeout and error handling
+ * @param resource - URL or resource to fetch
+ * @param options - Request options including optional timeout
+ * @returns Promise resolving to the fetch Response
+ * @throws {Error} On timeout, network error, or HTTP error status
+ */
 export async function fetchWithTimeout(
   resource: string,
   options: RequestOptions = {}
diff --git a/src/utils/auth.ts b/src/utils/auth.ts
index c57b754..3af825e 100644
--- a/src/utils/auth.ts
+++ b/src/utils/auth.ts
@@ -1,17 +1,33 @@
+/**
+ * Authentication Utility Functions
+ * Handles user authentication checks and sign out operations
+ */
+
 import { supabase } from './supabaseClient';
 import { NavigateFunction } from 'react-router-dom';
 
+/**
+ * Check if user is authenticated
+ * Verifies the current session and redirects to login if not authenticated
+ * @param {NavigateFunction} navigate - React Router navigate function for redirects
+ * @returns {Promise<boolean>} True if authenticated, false otherwise
+ */
 export const checkAuth = async (navigate: NavigateFunction) => {
   const { data: { session } } = await supabase.auth.getSession();
-  
+
   if (!session) {
     navigate('/login');
     return false;
   }
-  
+
   return true;
 };
 
+/**
+ * Sign out current user
+ * Terminates the user session and redirects to login page
+ * @param {NavigateFunction} navigate - React Router navigate function for redirects
+ */
 export const signOut = async (navigate: NavigateFunction) => {
   await supabase.auth.signOut();
   navigate('/login');
diff --git a/src/utils/cache.ts b/src/utils/cache.ts
index ef503e5..a742d6e 100644
--- a/src/utils/cache.ts
+++ b/src/utils/cache.ts
@@ -1,3 +1,11 @@
+/**
+ * In-Memory Cache Utility
+ * Provides simple key-value caching with TTL (Time To Live) support
+ */
+
+/**
+ * Cache item structure with value, timestamp, and TTL
+ */
 type CacheItem<T> = {
   value: T;
   timestamp: number;
@@ -5,17 +13,34 @@ type CacheItem<T> = {
   lastAccessed: number;
 };
 
+/**
+ * In-memory cache implementation with automatic expiration
+ */
 class Cache {
   private storage: Map<string, CacheItem<any>>;
   private readonly defaultTTL: number;
   private readonly maxSize?: number;
 
+<<<<<<< HEAD
+  /**
+   * Create a new cache instance
+   * @param defaultTTL - Default time-to-live in milliseconds (default: 5 minutes)
+   */
+  constructor(defaultTTL = 5 * 60 * 1000) { // 5 minutes default TTL
+=======
   constructor(defaultTTL = 5 * 60 * 1000, maxSize?: number) { // 5 minutes default TTL
+>>>>>>> origin/master
     this.storage = new Map();
     this.defaultTTL = defaultTTL;
     this.maxSize = maxSize;
   }
 
+  /**
+   * Store a value in cache with optional TTL
+   * @param key - Cache key
+   * @param value - Value to cache
+   * @param ttl - Time-to-live in milliseconds (uses default if not specified)
+   */
   set<T>(key: string, value: T, ttl = this.defaultTTL): void {
     const now = Date.now();
 
@@ -32,6 +57,14 @@ class Cache {
     });
   }
 
+<<<<<<< HEAD
+  /**
+   * Retrieve a value from cache
+   * Returns null if key doesn't exist or has expired
+   * @param key - Cache key
+   * @returns Cached value or null
+   */
+=======
   private evictLRU(): void {
     let lruKey: string | null = null;
     let lruTime = Infinity;
@@ -48,6 +81,7 @@ class Cache {
     }
   }
 
+>>>>>>> origin/master
   get<T>(key: string): T | null {
     const item = this.storage.get(key);
 
@@ -58,23 +92,41 @@ class Cache {
       return null;
     }
 
+<<<<<<< HEAD
+=======
     // Update last accessed time for LRU tracking
     item.lastAccessed = Date.now();
 
+>>>>>>> origin/master
     return item.value;
   }
 
+  /**
+   * Check if a key exists and is not expired
+   * @param key - Cache key
+   * @returns True if key exists and is valid
+   */
   has(key: string): boolean {
     return this.get(key) !== null;
   }
 
+  /**
+   * Remove a specific key from cache
+   * @param key - Cache key to delete
+   */
   delete(key: string): void {
     this.storage.delete(key);
   }
 
+  /**
+   * Clear all cached items
+   */
   clear(): void {
     this.storage.clear();
   }
 }
 
-export const cache = new Cache();
\ No newline at end of file
+/**
+ * Shared cache instance with 5-minute default TTL
+ */
+export const cache = new Cache();
diff --git a/src/utils/constants.ts b/src/utils/constants.ts
index c82ad9b..bf34e12 100644
--- a/src/utils/constants.ts
+++ b/src/utils/constants.ts
@@ -1,6 +1,12 @@
-// src/utils/constants.ts
-// Zentrale Konstanten für die gesamte Website
+/**
+ * Application Constants
+ * Zentrale Konstanten für die gesamte Website
+ */
 
+/**
+ * Contact information
+ * Kontaktinformationen für alle Kontaktpunkte auf der Website
+ */
 export const CONTACT = {
     email: "info@damjan-savic.com",
     phone: "+49 175 695 0979",
@@ -14,12 +20,20 @@ export const CONTACT = {
     }
 } as const;
 
+/**
+ * Current professional role
+ * Aktuelle berufliche Position und Unternehmen
+ */
 export const CURRENT_ROLE = {
     company: "Everlast Consulting GmbH",
     position: "Process Automation Specialist",
     since: "2024-12"
 } as const;
 
+/**
+ * Profile information
+ * Profil- und persönliche Informationen für die gesamte Website
+ */
 export const PROFILE = {
     name: "Damjan Savić",
     title: "Fullstack Developer",
diff --git a/src/utils/csrf.ts b/src/utils/csrf.ts
index 98f24f0..7430a6d 100644
--- a/src/utils/csrf.ts
+++ b/src/utils/csrf.ts
@@ -1,20 +1,31 @@
+/**
+ * CSRF Token Utility
+ * Verwaltung von Cross-Site Request Forgery Schutz-Tokens
+ */
+
 import { v4 as uuidv4 } from 'uuid';
 
 // CSRF token storage
 let csrfToken: string | null = null;
 
-// Generate a new CSRF token
+/**
+ * Generate a new CSRF token
+ */
 export const generateCsrfToken = (): string => {
   csrfToken = uuidv4();
   return csrfToken;
 };
 
-// Validate a CSRF token
+/**
+ * Validate a CSRF token
+ */
 export const validateCsrfToken = (token: string): boolean => {
   return token === csrfToken;
 };
 
-// Get the current CSRF token
+/**
+ * Get the current CSRF token
+ */
 export const getCsrfToken = (): string => {
   if (!csrfToken) {
     return generateCsrfToken();
diff --git a/src/utils/errorHandling.ts b/src/utils/errorHandling.ts
index 3a6e561..4a8689f 100644
--- a/src/utils/errorHandling.ts
+++ b/src/utils/errorHandling.ts
@@ -1,5 +1,13 @@
+/**
+ * Error Handling Utilities
+ * Centralized error handling and custom error types
+ */
+
 import { trackEvent } from './analytics';
 
+/**
+ * Custom application error class with error codes, severity levels, and metadata
+ */
 export class AppError extends Error {
   constructor(
     message: string,
@@ -12,6 +20,9 @@ export class AppError extends Error {
   }
 }
 
+/**
+ * Standard error codes used throughout the application
+ */
 export const errorCodes = {
   NETWORK_ERROR: 'ERR_NETWORK',
   API_ERROR: 'ERR_API',
@@ -20,6 +31,9 @@ export const errorCodes = {
   UNKNOWN_ERROR: 'ERR_UNKNOWN'
 } as const;
 
+/**
+ * Handle and normalize errors with tracking and logging
+ */
 export const handleError = (error: unknown, context: string) => {
   let appError: AppError;
 
@@ -52,6 +66,9 @@ export const handleError = (error: unknown, context: string) => {
   return appError;
 };
 
+/**
+ * Create an API error with HTTP status code
+ */
 export const createAPIError = (status: number, message: string) => {
   return new AppError(
     message,
diff --git a/src/utils/fontLoader.ts b/src/utils/fontLoader.ts
index 3aab35f..f04ec64 100644
--- a/src/utils/fontLoader.ts
+++ b/src/utils/fontLoader.ts
@@ -1,4 +1,13 @@
-// Font loading utility to ensure fonts are loaded before showing content
+/**
+ * Font Loading Utility
+ * Ensures fonts are loaded before showing content to prevent FOUT/FOIT
+ */
+
+/**
+ * Preload fonts asynchronously
+ * Uses the Font Loading API to ensure Inter font is loaded
+ * Falls back to system fonts on error
+ */
 export const preloadFonts = async () => {
   if ('fonts' in document) {
     try {
@@ -12,14 +21,18 @@ export const preloadFonts = async () => {
   }
 };
 
-// Call this function as early as possible
+/**
+ * Initialize font loading process
+ * Should be called as early as possible in the application lifecycle
+ * Adds loading state and fallback timeout to prevent indefinite loading
+ */
 export const initializeFonts = () => {
   // Add loading class immediately
   document.documentElement.classList.add('fonts-loading');
-  
+
   // Start font loading
   preloadFonts();
-  
+
   // Remove loading class after a timeout to prevent indefinite loading state
   setTimeout(() => {
     document.documentElement.classList.remove('fonts-loading');
@@ -27,4 +40,4 @@ export const initializeFonts = () => {
       document.documentElement.classList.add('fonts-fallback');
     }
   }, 3000);
-};
\ No newline at end of file
+};
diff --git a/src/utils/rateLimiting.ts b/src/utils/rateLimiting.ts
new file mode 100644
index 0000000..7ce2248
--- /dev/null
+++ b/src/utils/rateLimiting.ts
@@ -0,0 +1,71 @@
+/**
+ * Rate limit entry tracking request count and timestamp
+ */
+interface RateLimitEntry {
+  count: number;
+  timestamp: number;
+}
+
+const WINDOW_SIZE_MS = 3600000; // 1 hour
+const MAX_REQUESTS = 5; // Maximum requests per hour
+
+/**
+ * Rate Limiter for API request throttling
+ * Manages rate limiting based on IP addresses with sliding window
+ */
+class RateLimiter {
+  private cache: Map<string, RateLimitEntry>;
+
+  constructor() {
+    this.cache = new Map();
+  }
+
+  /**
+   * Check if an IP address is currently rate limited
+   */
+  isRateLimited(ip: string): boolean {
+    const now = Date.now();
+    const entry = this.cache.get(ip);
+
+    if (!entry) {
+      this.cache.set(ip, { count: 1, timestamp: now });
+      return false;
+    }
+
+    if (now - entry.timestamp > WINDOW_SIZE_MS) {
+      this.cache.set(ip, { count: 1, timestamp: now });
+      return false;
+    }
+
+    if (entry.count >= MAX_REQUESTS) {
+      return true;
+    }
+
+    entry.count++;
+    return false;
+  }
+
+  /**
+   * Get remaining attempts for an IP address
+   */
+  getRemainingAttempts(ip: string): number {
+    const entry = this.cache.get(ip);
+    if (!entry) {
+      return MAX_REQUESTS;
+    }
+    return Math.max(0, MAX_REQUESTS - entry.count);
+  }
+
+  /**
+   * Get time in milliseconds until rate limit resets for an IP
+   */
+  getTimeToReset(ip: string): number {
+    const entry = this.cache.get(ip);
+    if (!entry) {
+      return 0;
+    }
+    return Math.max(0, WINDOW_SIZE_MS - (Date.now() - entry.timestamp));
+  }
+}
+
+export const rateLimiter = new RateLimiter();
\ No newline at end of file
diff --git a/src/utils/serviceWorkerRegistration.ts b/src/utils/serviceWorkerRegistration.ts
index 1246246..72d05f3 100644
--- a/src/utils/serviceWorkerRegistration.ts
+++ b/src/utils/serviceWorkerRegistration.ts
@@ -1,3 +1,12 @@
+/**
+ * Service Worker Registration Utility
+ * Handles registration and unregistration of service workers for PWA functionality
+ */
+
+/**
+ * Registers the service worker
+ * Automatically registers the service worker after the window load event
+ */
 export function register() {
     if ('serviceWorker' in navigator) {
         window.addEventListener('load', () => {
@@ -14,6 +23,10 @@ export function register() {
     }
 }
 
+/**
+ * Unregisters the service worker
+ * Removes the currently registered service worker
+ */
 export function unregister() {
     if ('serviceWorker' in navigator) {
         navigator.serviceWorker.ready
diff --git a/src/utils/supabaseClient.ts b/src/utils/supabaseClient.ts
index 3e9dcc1..566d67e 100644
--- a/src/utils/supabaseClient.ts
+++ b/src/utils/supabaseClient.ts
@@ -1,6 +1,30 @@
+/**
+ * Supabase Client Configuration
+ * Zentrale Konfiguration für die Supabase-Verbindung
+ */
+
 import { createClient } from '@supabase/supabase-js';
 
 const supabaseUrl = 'https://mxadgucxhmstlzsbgmoz.supabase.co';
 const supabaseAnonKey = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJzdXBhYmFzZSIsInJlZiI6Im14YWRndWN4aG1zdGx6c2JnbW96Iiwicm9sZSI6ImFub24iLCJpYXQiOjE3MzkwMDgwNjIsImV4cCI6MjA1NDU4NDA2Mn0.MmFqEm7OfwzOlSegLYl9YWLCmIp8YajzK3Aozubn66Q';
 
+/**
+ * Supabase Client Instanz
+ *
+ * Vorkonfigurierter Supabase-Client für den Zugriff auf die Datenbank.
+ * Verwendet die anonyme (anon) Rolle für öffentliche Zugriffe.
+ *
+ * @example
+ * // Daten aus einer Tabelle abrufen
+ * const { data, error } = await supabase
+ *   .from('table_name')
+ *   .select('*');
+ *
+ * @example
+ * // Authentifizierung
+ * const { user, error } = await supabase.auth.signIn({
+ *   email: 'user@example.com',
+ *   password: 'password'
+ * });
+ */
 export const supabase = createClient(supabaseUrl, supabaseAnonKey);
\ No newline at end of file
diff --git a/src/utils/webVitals.ts b/src/utils/webVitals.ts
index 8fb3ba1..8de9a4c 100644
--- a/src/utils/webVitals.ts
+++ b/src/utils/webVitals.ts
@@ -1,5 +1,13 @@
+/**
+ * Web Vitals Reporting Service
+ * Tracks and reports Core Web Vitals metrics to Google Analytics
+ */
+
 import { onCLS, onINP, onLCP, onFCP, onTTFB } from 'web-vitals';
 
+/**
+ * Web Vitals metric data structure
+ */
 interface Metric {
   name: string;
   value: number;
@@ -8,6 +16,9 @@ interface Metric {
   id: string;
 }
 
+/**
+ * Send Web Vitals metric to Google Analytics and dispatch custom event
+ */
 function sendToAnalytics(metric: Metric) {
   const body = JSON.stringify({
     name: metric.name,
@@ -45,6 +56,9 @@ function sendToAnalytics(metric: Metric) {
   // }
 }
 
+/**
+ * Initialize Web Vitals reporting for all Core Web Vitals metrics
+ */
 export function reportWebVitals() {
   onCLS(sendToAnalytics);
   onINP(sendToAnalytics);
@@ -53,7 +67,9 @@ export function reportWebVitals() {
   onTTFB(sendToAnalytics);
 }
 
-// Helper function to get Web Vitals score
+/**
+ * Calculate Web Vitals rating based on metric thresholds
+ */
 export function getWebVitalsScore(metric: Metric): string {
   const thresholds = {
     LCP: { good: 2500, poor: 4000 },