If you have anything you don't use anymore, and it's too large to sell online, Craigslist should be your go-to place to sell stuff. In college, you may want to sell all your furniture before moving home from school at the end of the year. Depending on what you own, a few $100 might be better than storing it or transporting it back with you. It's easy to setup a listing and sell anything on Craigslist.
Do you have stuff in your garage that you don't use anymore? Maybe a bicycle or camping gear? Maybe it's something that you do use, but not very often. If you want to put your stuff to work for you, consider using a service like Rentything, which allows you to rent almost anything you own. You just create your own rental shop and list items to rent. People contact you and pay you online through the platform. A simple and easy way to boost your income! A similar site is Zilok.
Another popular site to earn money doing gigs is Amazon's Mechanical Turk. You get paid a very small amount per gig (sometimes as low as $0.05) but you can do these tasks very quickly. For example, you could be asked to identify a picture or type certain text. When I was in college, I used to do these gigs in class and earn money while taking notes.
These part-time positions are only available to college students. Beyond that, no specific experience is required, but students studying nursing, medicine or psychology get bonus points. Other requirements for Papa Pals include a reliable four-door car and appropriate car insurance. All applicants must be able to pass a thorough background check, and the approval process takes between two and 10 business days.
Unlike school notes, people need notes taken for everything. For example, senior citizens and disabled persons consistently need help taking notes, and many local Heath and Human Services departments pair up note takers to people in need. If you have time and are willing to travel around town, you could earn a little side income taking notes for the needy.
You’re responsible, compassionate, and don’t mind giving up your Friday and Saturday nights: you could make a great baby or dog or house sitter. Though there are professional websites and agencies out there you could join, you may have luck volunteering your services to friends or family you already know. (Per usual, be wary of taking money from strangers...) And why not offer to wash the dishes or fold the laundry for an extra $10?
Search for freelance writing and editing gigs. The rates for these jobs vary: you may be paid by the word, be offered a flat rate for a project, or in some cases can be paid an hourly rate. You typically won't be able to retain copyright over your work or collect royalties, however. Even so, by doing freelance work you can build a portfolio and make valuable connections which may later pay off with more stable job opportunities.