Each topic chapter follows a consistent interview-ready structure: a direct answer you could give in the first two minutes, a deep first-principles explanation, an architecture diagram, internal working, a real-world example from a FAANG-level company, likely follow-up questions, common mistakes, trade-off tables, performance/scaling/security/accessibility considerations, and a memorable summary.

System design chapters follow the standard frontend system design interview format: requirements, architecture, component breakdown, API design, state management, rendering strategy, performance, caching, error handling, offline support, accessibility, security, SEO, monitoring, trade-offs, scalability, and follow-ups.

---

Part I — Rendering & React Internals

1. Rendering Strategies: CSR, SSR, SSG, ISR, Streaming SSR
2. React Server Components & Hydration
3. React Fiber, Reconciliation, Concurrent Rendering & Suspense

Part II — Browser Internals & Performance

1. Browser Rendering Pipeline, Critical Rendering Path & Event Loop
2. Caching, CDN, Service Workers & PWAs
3. Bundle Optimization: Code Splitting, Lazy Loading & Virtualization

Part III — Application Architecture

1. Next.js Deep Dive: App Router, Rendering & Caching
2. State Management: Redux vs. Zustand vs. React Query/SWR
3. API Layer: REST vs. GraphQL vs. WebSocket vs. SSE

Part IV — Cross-Cutting Concerns

1. Security: XSS, CSRF, CSP, CORS & Authentication
2. Accessibility, SEO & Core Web Vitals

Part V — Scaling Frontend Engineering

1. Micro Frontends, Module Federation, Monorepos, Design Systems & DevOps

Part VI — System Design Deep Dives

1. Design an Instagram/Facebook-Style Infinite Feed
2. Design Google Docs (Real-Time Collaborative Editor)
3. Design a Notification System
4. Design a Chat System (Slack / WhatsApp-Style)
5. Design a Video Streaming Homepage (Netflix / YouTube-Style)
6. Design a Search Autocomplete System

Appendix — Quick-Revision Cheat Sheet

---