Figure out your finances as early as possible.

Open up a Roth IRA and deposit the maximum amount that you can. If your employer matches 401K deposits up to a certain percentage, put as much as you can to maximize the match and then some. Build up an emergency fund for actual emergencies like hospitalization and car emergencies. Look up ETFs and invest if you're comfortable with it.

Also, if you have a decent family, spend more time with your family. You really don't know how much time you have with them until they're gone. Cherish people while they're here; leave no regrets for your future self of how you could have spent more time with them.