A whole lot of serious advice in this thread that I wished I had had back when I was a youngster
Just to add on it, travel as much as you can/want. As we all can see, anything can happen nowadays, including a fukking pandemic, and I'm out here regretting every single trip I didn't take because "Oh well, I'll go next year". There's so much to see and experience out there, it adds so much to your life imo. All that material stuff is nice, but trust me travelling in your 20s is not like travelling when you're in your 30s, and def not like travelling when you're in your 40s. Along the same lines, if you have any hobby/interest, whatever it is, invest time in it. Even if it's not to make a career out of it, there has to be more to your life than "just" making money, investing and paying bills. Exercise regularly, even if it's just light work. As long as you do it regularly. Walk. Try new things/activities regularly, keep your horizon open. I'd advice not to really think about fully "settling down" before at least 30.
And obviously : WEAR A CONDOM





