How can I start a mini business with college life? I don' have much money to invest. What and how should I do?

If you want to start earning in your college life, you can start a tuition classes, if you have any special talent like singing, dancing whatever, you can also earn from your talent, now a days social media is also helpful for earning you can make a videos for YouTube it takes time but it will help

You can become an Insurance agent, part time sales personnel / retail counter sales / delivery staff for an commerce company. Conduct tuition for school going kids, etc.