Tailwind CSS v4 is an architectural upgrade: goodbye tailwind.config.js, declare design tokens in @theme blocks inside native CSS files. Single @import "tailwindcss" entry replaces postcss.config; built-in CSS vars, native container queries, oxc engine 10-40x faster, simplified color functions.
Complete monorepo guide for large fullstack projects: pnpm workspace for unified dependency install + linking, Turborepo for task orchestration, incremental builds and remote caching. Compares Nx/Lerna, includes code sharing and release best practices.
Modern responsive CSS pillars: Container Queries for component-level responsiveness based on parent size (not viewport), plus :has() parent selector for ancestor styling based on descendants.
React 18 introduces revolutionary features like concurrent rendering, automatic batching, useTransition, and useDeferredValue. This article systematically covers correct useState/useEffect usage, useMemo/useCallback optimization boundaries, custom Hook design patterns, and a complete guide to avoiding stale closures, race conditions, and other pitfalls in concurrent mode.
