I've already done some things to prepare me for the future, like setting up a Roth IRA. I also eat healthy and exercise so I stay in shape. What are some other things I can do to make sure I have a better future?

Edit to add more context: I'm 18M and getting a degree in mechanical engineering. I'm financially literate enough to understand loans, amortization, and credit, and will make sure to pay off my student loan debt quickly.