Additional resources and links

Here is a small list of resources I found useful to understand hooks or use them every day to conclude this guide.

Introducing Hooks: if you have never heard of hooks, probably the best place to start. The complete official documentation about hooks is very well written and the best reference.
React Today and Tomorrow and 90% Cleaner React With Hooks: the conference by Sophie Alpert and Dan Abramov introducing hooks.
How to fetch data with React Hooks?: an in-depth guide by Robin Wieruch on calling an API in a component. His blog contains a lot of exciting articles about React and hooks.
Myths about useEffect: excellent practices, tips, and tricks for using useEffect, by Kent C. Dodds.
React Hooks Testing Library: an excellent library to write unit tests for your hooks, independently of any component.

useHooks, Easy to understand React Hook recipes: many custom hooks, commented so you could know how they work. Very nice if you prefer developing custom hooks for a precise need instead of just looking for a third-party library.
Hooks with React Redux: if you use Redux, you’ll be happy to know that you can now use it with some handy hooks it provides.
React Native Hooks: hooks can make your code cleaner in React Native too. Here you’ll find hooks for everyday operations, such as accessing the clipboard or getting the device orientation.

A Complete Guide to useEffect: written by Dan Abramov, a profound article. Don’t expect to read it during a small break, but if you master everything said in this article, you can consider yourself an expert with useEffect. All the posts on this blog are worth reading.
Why React Hooks over HOCs: if you used high-order components a lot, here is an article comparing them with hooks and explaining how hooks often represent a better way to do things.
A Thoughtful Way To Use React’s useRef() Hook: some situations where using a ref with useRef can be useful.