Lists are a way for you to keep track of and organize books you want to read, have read, or want to recommend to people.
All you need to do to start is find a book, click on it and then click the SAVE FOR LATER button. This will move it to the uncategorized list, which is the only list you will have by default. Once that button is clicked it will change to a VIEW IN LISTS button, which is the easiest way to get to your lists page. The other way to your lists is by going to your account page and clicking on My Lists. On that page you can add more lists and move around books between your lists.