Here are some best practices to follow while coding in React.js:

1. Component Structure

• Functional Components: Prefer functional components over class components for simplicity and better performance.
• Separation of Concerns: Organize components logically (e.g., presentational vs. container components).

2. State Management

• Lift State Up: Keep state in the closest common ancestor of components that need it.
• Use Context API: For global state management, consider using the Context API instead of prop drilling.

3. Hooks Usage

• Use Built-in Hooks: Utilize built-in hooks like useState, useEffect, and useContext for managing state and side effects.
• Custom Hooks: Create custom hooks for reusable logic.

4. Performance Optimization

• Memoization: Use React.memo for components and useMemo/useCallback for functions to prevent unnecessary re-renders.
• Code Splitting: Implement lazy loading with React.lazy and Suspense to improve load times.

5. Prop Types and Default Props

• Prop Types: Use prop-types to validate props passed to components.
• Default Props: Define default props to ensure components have fallback values.

6. Accessibility

• Semantic HTML: Use semantic HTML elements for better accessibility.
• ARIA Roles: Implement ARIA roles and attributes where necessary to enhance screen reader support.

7. Testing

• Unit Testing: Write unit tests for components using libraries like Jest and React Testing Library.
• End-to-End Testing: Use tools like Cypress for end-to-end testing of your application.

8. Code Quality

• Linting: Use ESLint with a React plugin to enforce coding standards.
• Formatting: Use Prettier for consistent code formatting.

9. Documentation

• Commenting: Write clear comments and documentation for complex logic.
• Storybook: Use Storybook to document and showcase components in isolation.

10. Version Control

• Git Commits: Use meaningful commit messages and follow a consistent branching strategy (e.g., Git Flow).

By following these best practices, you'll improve the maintainability, performance, and accessibility of your React applications.