1. Advanced Schema Design Schema design is crucial in GraphQL. It defines the types, queries, and mutations your API will support. A well-designed schema helps ensure that your API is intuitive and efficient. 1.1 Types and Relationships Object Types: Define the core data structures. For example, a User type with fields like id, name, and email. Input Types: Used for complex input data in mutations. For instance, UserInput might include fields for name, email, and password.