Hooks (useState, useEffect, useMemo, useCallback, useRef, useContext, useReducer), reconciliation, virtual DOM, keys, state management (Context, Redux, Zustand), performance (memo, lazy loading, code splitting), custom hooks, error boundaries, and React 18 features.
Execution context, hoisting, closures, the event loop, this keyword, call/apply/bind, promises, async/await, Promise combinators, prototypes, prototypal inheritance, array methods, debounce, throttle, currying, event bubbling, CORS, and polyfills.
Rendering strategies (CSR, SSR, SSG, ISR), state management at scale, API design (REST, GraphQL, polling, WebSockets), performance (Core Web Vitals, caching, CDN), accessibility, component design, and microfrontends.
Arrays, strings, hashing, two pointers, sliding window, linked lists, stacks, queues, trees, BST, graphs (BFS, DFS), dynamic programming (basics), sorting, and searching. Practice on LeetCode or HackerRank.
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