Old workout gear
If you’re a sports lover and you have a bunch of old sports accessories, you should throw them out. For example, sports bras that were worn consistently for several months should be replaced every six months. The same goes for running shoes, which should be replaced every eight months.
Former best sellers
You already read that book? Exchange books with friends, or find a Little Free Library and donate your book in exchange for a brand new one. The point is not to free your shelves, but to make room for new stuff!
Dated reference books
Outdated information won’t help you anymore, so there’s no need to keep those books, unless you have an emotional attachment.