GraphQL Guides
These guides provide information on getting started with GraphQL:
Introduction to GraphQL: A guide to GraphQL terminology and discovering the API
Forming Calls with GraphQL: How to form API calls in GraphQL
Migrating from REST to GraphQL: Examples of migrating from a REST API to GraphQL
Using the Explorer: How to make GraphQL queries using GitHub's Explorer
GraphQL Resource Limitations: A guide to rate and node limits