There is no tutorial, It is a learn while doing...
The overall idea is JUST like a real book.
You have a BOOK title > eg. like a book title (is like a container)
Suppose it is a book about animals.. you have cats; insects etc.. (idea)
You make (example) 1 NEW book with title Cats and 1 NEW with title Insects.
Now you have 30 pages created.... 16 about different species of Cats and 14 about Insects
Now maybe you have hairless cats or taill-less cats and insects with wings etc...(idea)
Now create a CHAPTER (setting=books/chapter) UNDER (as subfolder) MAIN BOOK: CATS
-- Hairless (chapter includes the pages)
--Taill-less (chapter includes the pages)
You assign EACH PAGE to one of those chapters...
And so on...
You now can have the BOOKS as links in doprdown Or maybe Chapters etc...
That is basically the idea.. do not overcomplicate it.. (staircase alike)