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JSX syntax, component types, props, children, keys, and composition patterns.

useState, useEffect, useRef, useMemo, useCallback, useReducer, useContext, and custom hooks.

State management, prop drilling, lifting state, context, controlled vs uncontrolled components.

React.memo, useMemo, useCallback, virtualization, lazy loading, Suspense, and code splitting.

HOCs, render props, compound components, error boundaries, portals, and forwardRef.

React Router, React Query/TanStack, testing, React Server Components, Next.js, SSR/SSG.