Let’s say you’ve decided to clean up a bit of space and decided to get rid of some old popular psychology books, some cookbooks you never really opened, your old Twilight copy (you definitely won’t read it again!), and a few anatomy textbooks that are simply collecting dust on your shelves. Great idea—you can make use of them to earn extra cash! So, where to start? In this guide, we’ve prepared six tips on how you can sell your used books to get the most profit.