Frontend 0 → PRO

TS config (tsconfig), strict mode ★ recommended

Types vs interfaces, unions/intersections ★ recommended

Generics and utility types ★ recommended

Typing API contracts (DTOs) ★ recommended

Migration JS → TS strategy ★ recommended

Pick one: React / Vue / Angular (core concepts) ★ recommended

Routing & code splitting ★ recommended

State management patterns ★ recommended

Data fetching (caching, retries) ★ recommended

SSR/SSG overview (Next/Nuxt/etc.) ★ recommended

Component design & composition ★ recommended

Design systems basics ★ recommended

Forms at scale (validation, UX) ★ recommended

Error boundaries and resilience ★ recommended

Feature flags (overview) ★ recommended

Unit testing (Vitest/Jest) ★ recommended

Component testing (Testing Library) ★ recommended

E2E (Playwright/Cypress overview) ★ recommended

Mocking APIs, fixtures ★ recommended

CI tests + coverage basics ★ recommended

Web performance basics (LCP/CLS/INP overview) ★ recommended

Bundle analysis and optimization ★ recommended

Caching strategy (HTTP cache, SW overview) ★ recommended

Security: XSS/CSRF/CSP overview ★ recommended

Deploy checklist (env, errors, monitoring) ★ recommended