Long term investment strategies for a 21 y/o?

I’m a college student with zero financial knowledge. My school has a credit union account to save my $$ and I had been making small investments in a few popular stocks. I don’t really know where to go from here, as far as budgeting is concerned. How do I make the best of my $$? Any advice would be greatly appreciated. <br><br>TL;DR: I’m a broke college student and I could really use some financial advice.