Introduction about GraphQL in Magento2.x – Part-2:

Before start using the GraphQL service, we need to understand the basics with in below topic of GraphQL.

Queries and Mutations in GraphQL:

1. Fields
2. Arguments
3. Aliases
4. Fragments
5. Operation name
6. Variables
7. Directives
8. Mutations
9. Inline Fragments

Schemas and Types :

1. Type System
2. Type Language
3. Object Types and Fields
4. Arguments
5. The Query and Mutation Types
6. Scalar Types
7. Enumeration Types
8. Lists and Non-Null
9. Interfaces
10. Union Types
11. Input Types

To get in-depth detail for above points please refer https://graphql.github.io/learn/queries/