Basics: Explain the difference between props and state in React. What are React hooks? Can you provide a brief explanation of any two hooks you frequently use? Lifecycle & Effects: Describe the lifecycle of a class component. How does it contrast with the effect hook (useEffect) in functional components? How can you mimic componentDidMount behavior using hooks? State Management: Explain the core concepts behind Redux. How would you manage global state without Redux or Context API? Performance: What is virtual DOM, and how does it help improve application performance? Describe some methods or tools you would use to identify and rectify performance bottlenecks in a React app. Ecosystem & Advanced Topics: Have you used React Router? Describe a scenario where you had to implement nested routing. Explain the benefits and potential pitfalls of using React's Context API. How do you handle side-effects in your React applications? Miscellaneous: How do you handle forms in React? Are there any libraries or patterns you prefer? Describe how React's reconciliation algorithm works.