Although this is a very good effort. I can't see where the user who registers for a class can actually see all of their classes added. Also, once you are in a class what can you do? There needs to be more modules to show what classes the user is registered for and atleast have their classes seen in their profile.

Thanks to Rob, I now know how to use this component.
You can see what the component is for on this site: to show a collection of books on a website (whether virtual or a real library), with possibility for lend requests and reviews by users.
http://www.joomlawebserver.com/books/index.php

The component is quite easy to use:

- Install the component
- Configure backend and frontend settings in the admin
- Create a menu link to the component (Menu manager in Joomla)
- in the backend, create a book category
- Go to "manage books"
- Enter a new book using "New" button

Tip:
You can look up book ISBN numbers on Amazon or some other book site. With ISBN numbers entered in the book, you don't need to enter all book details manually but can pull them in from Amazon. You can of course enter book details manually also, if you want.

- Save the book

Once you have the book saved, select the book in BookManager
- Click "Refetch information" (twice, also on next page)
This will download the info from Amazon for that book.

- Now in "Book Manager" publish the book.

That's it, you're done. The book will now show up in the frontend in your site in the category you created.

I love this little application but I have only one complaint. When I choose the "Restrict who can post jobs to this access level" and set it to a certain level and then go back to a test user who's not within that access level, the user is still able to post jobs. This would mean any and everybody can post jobs.