The first thing that you can sell in college are the notes you take in class. There are many ways to do this. Almost every major campus typically has a note-taking/note-selling service on campus. For example, the University of California, San Diego has A.S. Lecture Notes, which pays note takers and charges note buyers. However, there are also online services such as StudySoup, which allow students to sell their notes online. There are students who are making over $5,000 to $10,000 selling their notes.
If you have relatively impressive cooking skills and some room to host guests, sign up for Eat With – a cool new service connecting travelers with hosts around the world, who invite them to a small dinner party for a fixed fee. As a host, you can set a rate per guest, choose the time and dates when you are available to throw a feast and indicate the max amount of people you are ready to invite (usually less than 6).
Watch for emails asking for note-takers. Once a fellow students' needs are documented, disability services will contact the professors and ask for volunteers in the class to take notes, and your professor will in turn email the class. You can also upload your notes to a platform like Stuvia, where you can earn money by selling your notes to other classmates.