I'm reading thisbook with GraphQL content.

Thanks@leonardomso

Pagination: Cursor Pagination

• Cursor pagination is generally a great choice, because of the accuracy and performance
• Maybe it's the most common pattern in GraphQL at the moment
• This pattern lets us design more complex use cases, because of Connection and Edge types
• Relay clients integrate perfectly with your API because of that

Global Identification: Global ID — Node

• Like Connections, they can be a good pattern even outside of a Relay context
• Opaque IDs are recommended
• You necessarily don't need global identification if you're not planning to use Relay
• Ensure your global identification contains enough context to globally route to a node, especially in a distributed architecture

Non-Nullability

• It lets clients avoid defensive code/conditionals
• It helps to build more predictable schemas

tradeoffs/warnings:

• It's very hard to predict what can be null
• Non-null fields and arguments are harder to evolve. Going from non-null to null is a breaking change, but the opposite is not

guidelines for nullability:

• Should almost always nullable fields that return object types that are backed by database associations, network calls, or anything that could potentially fail
• Non-null for arguments, because it's more predictable and easy to understand API

That's it.
My first part of the book summary. Thank you.