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Understanding the critical timing difference between useEffect and useLayoutEffect - when to use each hook to prevent UI flicker and optimize performance in React applications.

Exploring how Custom Hooks revolutionized React by solving logic reuse challenges that plagued Class components, HOCs, and Render Props - making code cleaner, more composable, and easier to maintain.

Understanding useEffect - the essential hook for managing side effects in React function components, from data fetching to event listeners, with proper cleanup and dependency management.

Learn why React requires immutable state updates and how reference equality checking works. Understand the difference between primitive and reference comparisons, common pitfalls with object mutations, and best practices for creating new references to trigger re-renders correctly.