How to Sell Used Textbooks Profitably

Is this something you face at the end of each semester?

“I feel really bad just throwing my textbooks away knowing they could help someone, but in most of them there is at least a bit of writing for example I highlighted topics that were in the advanced information for science and sometimes I ticked off practice questions that I did. Is there any place that accepts books like this or do they have to be super new to be sold?”

reddit avatar —Redditor Emotional_Alarm8279