A Moodle “book” 📚can present multi-page learning content in a book-like format.
Web pages that have already been created can be imported directly into a book. Books can be printed as a whole or chapter by chapter. A book can consist of chapters and subchapters. However, a subchapter cannot be divided into further subchapters.
To learn how to create a “book” in Moodle, see the official Moodle documentation at moodle.org.