Important topics

• Fundamentals: JSX, components, rendering (virtual DOM, reconciliation)
• Component design: Thinking declaratively, props, state, structure
• React hooks: Common hooks (e.g. useState, useEffect), rules of hooks, best practices
• Differences between controlled and uncontrolled components
• Event handling in React
• Common pitfalls (e.g., stale closures, unnecessary re-renders)
• Performance optimizations: memoization, lazy loading, React Profiler