1. 1. Introduction
2. 2. Quickstart
3. 3. Type system
4. 1. 3.1. Objects
   2. 1. 3.1.1. Complex fields
      2. 3.1.2. Context
      3. 3.1.3. Error handling
      4. 1. 3.1.3.1. Field errors
         2. 3.1.3.2. Schema errors
      5. 3.1.4. Generics
   3. 3.2. Interfaces
   4. 3.3. Unions
   5. 3.4. Enums
   6. 3.5. Input objects
   7. 3.6. Scalars
5. 4. Schema
6. 1. 4.1. Subscriptions
   2. 4.2. Introspection
7. 5. Serving
8. 1. 5.1. Batching
9. 6. Advanced Topics
10. 1. 6.1. Implicit and explicit null
    2. 6.2. N+1 problem
    3. 1. 6.2.1. DataLoader
       2. 6.2.2. Look-ahead
       3. 1. 6.2.2.1. Eager loading