The Stitch IDE includes an interactive schema explorer with the same content as the site below, however if you're on mobile, or prefer a less interactive experience, you may access the API reference docs here
GraphQL Specification is the official specification of the GraphQL language.
GraphQL Learn provides a more approachable introduction to GraphQL.
Stitch aims to maintain compatibility with the Relay Server Specification.
Stitch currently uses Apollo Server to serve API requests.