Greetings, I have sold textbooks online several times and can share my experience. I used different platforms, but in my last experience I really liked https://booksrun.com/ . This service offered a user-friendly interface for uploading book information and found buyers quickly. Important aspects for me were the simplicity of the process and the speed of receiving money after the sale. I recommend paying attention to the condition of the books when uploading information - this affects the price that will be offered. If you have textbooks you no longer need, BooksRun is a great option for selling!