Security — Part 1 (this file)

1. [Web Security Fundamentals](#1-web-security-fundamentals)
2. [Authentication](#2-authentication)
3. [Browser Security](#3-browser-security)
4. [Common Attacks](#4-common-attacks)

Coming next (Parts 2–4): Authorization (RBAC/ABAC) · Secure Storage (Cookies/localStorage/IndexedDB) · HTTPS/TLS/HSTS · API Security · Frontend Security (Sanitization/DOMPurify/React) · File Upload Security · Dependency Security · Production Security (Headers/CSP Reporting/Monitoring) · then the full Accessibility half: Fundamentals/WCAG · Semantic HTML · ARIA · Keyboard Accessibility · Screen Readers · Forms · Color Accessibility · Media Accessibility · Accessible Components · React Accessibility · Accessibility Testing.

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