More and more teams are choosing GraphQL instead of (or along with) REST for their web APIs. GraphQL queries give clients great flexibility in the way they request data from the server, preventing issues such overfetching or underfetching of data, and allowing multiple resources to be retrieved in a single request.
This course will guide you through a practical example, a full-stack javascript application, that will introduce you to the main concepts required to develop both GraphQL servers and clients. It will introduce you to the GraphQL Schema Definition Language, show you how to write Queries and Mutations, plug in Authentication/Authorization, and enable caching in a client application using Apollo Client.
Who is the target audience?

javascript developers looking to learn GraphQL
Requirements
Good knowledge of modern javascript, including ES6+ and NodeJS
Some knowledge of Express and React preferable but not strictly required
What you'll learn
Build a GraphQL server based on NodeJS, Express and Apollo Server
Invoke GraphQL APIs from javascript client applications using regular HTTP requests or Apollo Client
Handle Authentication/Authorization, Caching, and more



https://www.udemy.com/graphql-by-example/