Modern React patterns and best practices for production applications.

• Covers component design principles, hook extraction patterns, and state management selection across complexity levels from simple useState to global stores like Zustand and Redux Toolkit
• Includes React 19 patterns with new hooks (useActionState, useOptimistic, use) and compiler benefits for automatic memoization
• Provides composition patterns including compound components, render props vs hooks trade-offs, and higher-order components for cross-cutting concerns
• Details performance optimization methodology: profile first, identify bottlenecks, then apply targeted fixes like virtualization or useMemo
• Addresses error boundaries, TypeScript prop typing strategies, testing priorities, and common anti-patterns to avoid