List of React Best Practices 2026: Component & Code Quality ⭐⭐⭐⭐⭐ Absolute imports over relative (tsconfig paths) Barrel exports (index.ts) for clean imports Feature-based folder structure over Type-based Colocate component, hook, test & style files Meaningful component & variable naming ESLint + Prettier + Husky setup Strict TypeScript mode Hooks Usage Rules ⭐⭐⭐⭐⭐ Never call Hooks inside loops or conditions Avoid overusing useEffect (use derived state instead) useMemo & useCallback only when measurably needed useRef for mutable values that shouldn't trigger re-render State Rules ⭐⭐⭐⭐⭐ Local state first, lift only when needed URL as State (search params) for shareable UI state Never store derived data in state Server state & client state - always keep separate JSX & Rendering Rules ⭐⭐⭐⭐⭐ Never use array index as key prop Avoid anonymous functions in JSX props Avoid object/array literals directly in JSX props Always handle loading, error & empty states Security ⭐⭐⭐⭐⭐ Avoid…