What are the 'books' under shortcuts?

This is where all the learning should take place. In other words:

You hit the site, log in, check the front page and then check Recent Activity. All these sections are in flux, they'll change all the time. They are NOT the places to go back to and look for things you previously saw. They are places to go and check on what's new.

The books section is broken up into different books. Anything in a book will stay in the book in the same position. Things like lessons, tunes, blogs will usually go into books and stay in the same spot.

When you hit the front page a lot of times you'll open an article and see an up button towards the bottom. That means the content is in a book. By hitting the up button you can travel back through the book to it's top.

You can also look at the bread crumbs at the top part of the page. A bread crumb shows you the path where you are. This is helpful in books to remember where articles are.

You can use the annotations feature also to mark the book.

Just remember that most things get filed into the online books. Learn where things are in the books and you'll always be able to come back to them.