"wiki wiki" means "very fast" (an Hawaiian term) and is indeed a fast method for creating content as a group.
Can be a powerful tool for collaborative work. The entire class can edit a document together, creating a class product, or each student can have their own wiki and work on it with you and their classmates.
The Book module makes it easy to create multi-page resources with a book-like format.
Previously created websites can be imported directly into the Book module. Books can be printed entirely or by chapter.
The book module allows you to have main chapters and sub chapters, but it goes no deeper. In other words, sub chapters cannot have their own sub chapters, as the module is intended to be a simple resource for teachers and students.