It’s a good book to learn GraphQL, especially in the context of React.
It doesn’t go very deep, but does few very important things:
1. It walks you through how you would implement the client (and its state management) without Apollo
2. It shows you how to use Apollo, making you appreciate the magic behind it
3. It shows you how to build a backend in node.js
The whole series “The Road to” is great and I highly recommend it if you want to learn React/GraphQL.