There are great resources for creating Books using pages.
Create your own materials for class.
Create content to share amongst other teachers.
Publish to the Apple Store to publish your or student work.
Three important things:
Make sure to use a Book Template.
Export as EPUB to have the book experience.
When sharing often things like Google Classroom don’t know what to do with it until downloaded.
Here are some books to guide you:
Pages for Mac Guide
Pages for IOS Guide