Book and Drupal 11

The latest stable release, 3.0.7, declares a core version requirement of ^11.2 || ^12, which covers Drupal 11.

The book module that up until Drupal 11 was part of Drupal core A book is a set of nodes tied together in a hierarchical structure, with chapters, sections, and subsections. You can use books for manuals, site resource guides, Frequently Asked Questions (FAQ), novel, or curricula. Any content type can be added to a book, and a book can contain nodes of more than one content type.