The book contains a fulloverview of what is needed to build great GraphQL APIs:
Performance & Monitoring
Migrating from legacy APIs
A lot more: Everything I’ve learnt on building GraphQL APIs is in there!
With the book you may also get the Complete Packagewhich contains:
Three extra guides (A schema design checklist you can keep close when building features, a full cheatsheet on making schema changes and evolving an API, and a few reviews of publicly accessible APIs to learn from existing APIs)
4 interviews with amazing GraphQL community members including folks from Shopify, GitHub & More