Is there a tour of the editor?
Yes. The Tutorial button in the top corner of the editor walks you through every section, and you can restart it anytime.
Open any book from My books, then click "Tutorial" in the top corner of the editor for a guided tour: editing messages, navigating pages, adding content, chapters, contacts, colors, fonts, opening pages, display options, the cover, and generating your book.
You can restart it anytime by clicking the same button, and this help center is always one click away next to it.