If you love taking pictures, you can sell your images and videos on stock websites and earn a percentage of money every time someone downloads your image or video
Work on campus
Many universities give students the option to work part-time on campus
Transcribe
There are many opportunities for students to transcribe documents and earn some extra money while studying. The payment for the same varies from project to project
Sell items Online
You can either re-sell items or sell products like paintings, crafts, food, etc that you can make in your free time or over the weekends to earn
money
Private tuition
If you have a keen interest in any particular subject or have good knowledge of, you can take private tuition to earn some extra money on the side