• CSR, SSR, SSG, ISR — difference between rendering strategies
• What is CORS and how does it work?
• HTTP status codes
• Browser storage: cookie, LocalStorage, SessionStorage and IndexedDB
• What is REST and REST principles — REST API
• What is the difference between authorization and authentication?
• Ways to optimize applications
• How HTTPS works and difference from HTTP
• How HTTP works and what an HTTP request consists of
• What is JWT and how does it work?
• What is critical rendering path (crp) in browser
• When reflow and repaint occur in browser
• What is WebSocket and how does it work?
• What is CSRF and how to prevent it?
• What is service worker?
• What is XSS and how to prevent it?
• How browser works when entering request and rendering stages
• How to debug application and find memory leaks
• Modern browser architecture (processes and threads)
• OWASP browser vulnerabilities
• Types of frontend testing
• V8 architecture: from code to machine instructions
• Parsing pipeline - from bytes to DOM and CSSOM
• Server-sent events, polling and long polling: what they are and when to use
• HTTP/2 vs HTTP/3: protocol evolution
• Immutability and mutability in JavaScript
• What are web workers?
• Resource loading strategies - preload, prefetch, modulepreload
• What is CDN and why is it needed?
• What is the difference between PUT and PATCH?