Here are some of the best practices to follow when coding in React:

1. Functional Components with Hooks: With the introduction of Hooks in React 16.8, it’s recommended to use functional components over class components. Hooks allow you to use state and other React features without writing a class. Key hooks include useState, useEffect, and useContext.
2. Component Composition: Rather than creating a few monolithic components that handle many tasks, prefer creating small, reusable components that each handle a single task. This is called “component composition,” and it’s a key principle in React.
3. Immutability: When working with state, always create a new state instead of modifying the current one directly. This is important for maintaining consistency and stability in your application.
4. Prop Types: Use Prop Types for type checking in your components. It’s a way of making components self-documenting and can help identify bugs.
5. Consistent Naming Conventions: Use a consistent naming convention for your components and functions. This improves readability and maintainability of your codebase.
6. Redux or Context API for State Management: Depending on the size and complexity of your application, you might want to use a state management library like Redux, or React’s built-in Context API, to manage global state.
7. Unit Testing: Make sure to write tests for your components to make your application robust and less prone to bugs. Tools like Jest, React Testing Library, and Enzyme can help with this.
8. Code Formatting: Use a code formatter like Prettier to keep your code style consistent. Also, consider using a linter like ESLint to catch common errors before they’re introduced into your codebase.
9. Use a modern development environment: Tools like Create React App, Next.js, or Gatsby.js provide a modern development setup with minimal configuration.

Here are some of the most important official resources and documentation for React:

1. React Official Documentation: The official React documentation is always the best place to start. It covers everything from basic to advanced topics.
2. React Hooks: A direct link to the Hooks section in the official React documentation.
3. React Context: A direct link to the Context API section in the official React documentation.
4. Create React App: The official documentation for Create React App, a tool that sets up a modern web app by running one command.
5. Redux: The official Redux documentation is a great resource if you choose to use Redux for state management.
6. Next.js: The official documentation for Next.js, a React framework for building JavaScript applications.
7. Gatsby: The official documentation for Gatsby, a React-based open source framework.
8. Jest: The official Jest documentation. Jest is a delightful JavaScript Testing Framework with a focus on simplicity.

I found this via @gziola on Twitter. It’s a smart and extensive cheatsheet for the JavaScript knowledge you will frequently need in modern projects.

Kudos to mbeaudru  : https://github.com/mbeaudru/modern-js-cheatsheet