# React Best Practices

## Project Structure
```
src/
├── assets/           # Static files
├── components/       # Shared components
│   ├── ui/          # Basic UI components
│   └── common/      # Common components
├── features/        # Feature modules
│   └── users/
│       ├── api/     # API calls
│       ├── hooks/   # Custom hooks
│       └── types/   # TypeScript types
├── hooks/           # Shared hooks
├── services/        # API services
├── store/          # State management
├── types/          # Shared types
└── utils/          # Utilities
```

## Component Patterns
- Use functional components
- Keep components small
- Extract reusable logic to hooks
- Implement error boundaries
- Use React.memo wisely

## State Management
- Local state for UI
- Context for themes/auth
- Redux for complex state
- Use proper selectors
- Normalize data

## Performance
- Lazy load routes
- Use React.Suspense
- Implement code splitting
- Optimize re-renders
- Cache API responses

## Data Fetching
- Use React Query/SWR
- Handle loading states
- Implement error handling
- Cache responses
- Optimize requests

## Forms
- Use form libraries
- Validate inputs
- Handle submissions
- Show feedback
- Maintain accessibility

## Testing
- Test user interactions
- Mock API calls
- Test error states
- Use testing library
- Write integration tests

## Security
- Sanitize inputs
- Prevent XSS
- Use HTTPS
- Handle auth properly
- Validate data

## TypeScript
- Define proper types
- Use interfaces
- Type props strictly
- Handle null checks
- Use generics wisely

## Development
- Use ESLint
- Format with Prettier
- Write documentation
- Review code
- Use CI/CD
