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← Theory library
GraphQL theory
Schema Definition Language, query planning, and DataLoader batching.
Practise in the Code Lab →
Easy
1. Schema Definition Language (SDL) & Queries
Declarative data fetching without over/under-fetching.
3. Mutations, Variables, and Input Validation
Changing server state safely through typed operations.
Medium
4. Pagination, Filtering, and Sorting
Keeping collection queries bounded and predictable.
Hard
2. The N+1 Problem & DataLoader
Batching and caching resolver lookups.
5. Caching, Persisted Queries, and Authorization
Making GraphQL fast and safe under real traffic.
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