Books and Pages actions

Book Actions

Edit and Delete will respectively let you edit the details of the book, or delete it.
Copy will copy the entirety of the book, without things like permissions, a warning detailing this, will be displayed.
Sort, will let you move the contents of the book inside of it, in a drag and drop fashion.
Permissions let you manage who has visibility of the book.

Page actions

Pages have some actions in common in books that have the same functionality, like Edit, Copy, Delete and Permission.

Move let you move the page you have currently open, to another book of your choice.
Revisions let you see all the history of the page, who has modified what and when. From there you may choose to see the changes and compare with your current version, or you can restore a previouse version of the document or delete the entry of the history

While editing the page, the draft will auto save every once in a while, if you want to save the contents manually and go back to just viewing the page, you can click the "Save Page" button, in the upper right