Financial problems for college students

I'm in my second year of university. My finances are always a mess at the beginning. I've decided to change that. I thought about it, the living expenses given to me by my family should be about 100 yuan left every month. Please give me some investment suggestions according to my situation, I would be very grateful! (I hope it's a financial management method that doesn't require too much time and energy, because I still have to study.) I want to try other financial management methods other than savings. I heard on the Internet that funds are good. I plan to buy some funds. I don't know if it's reasonable. Can I buy funds with this money? What kind of fund should I buy? What were the specific steps?