There's a lot of things you can only do when you're physically young.

Get them done now, while you can, because it will go away.

Move to a country/location/environment where you can actually achieve your goals/dreams ASAP. Location is the number 1 determining factor imo. This is step zero, nothing happens without this.

Build a lean, aesthetic physique (assuming you're a guy). Workout and stay healthy.

Get skills ASAP. Stack as many real tangible skills as you can. Skills will pay your bills and will be the foundation of your career.

If you have not already done this, in addition to maxing out your 401(k), start a Roth IRA and max it out every single year. I regret not doing this.

Compound interest is everything for most regular people to build net worth. Compound debt is the worst.

As the saying goes, there will be friends for a reason, friends for a season, and friends for a lifetime. Friendships will run their natural course. That being said, do your best to maintain friendships you want to try to keep as you get older.

Don't get stuck in the friend zone. Be bold and ask that person out umambigously.

As many dentists say, floss the teeth that you want to keep. I recommend flossing then Water Pik then brushing with a mechanical toothbrush like an Oral-B.

If you don't know, learn how to cook. There are so many resources out there. While not knowing how to cook might be cute or excusable by a potential partner in your 20s, by your 30s or 40s it is no longer funny and definitely a liability.

Don't sit all day. Even standing desks aren't enough. Do some light calisthenics every hour. Push-ups, wall-sits, squats, knee bends.

Make the time to see friends in-person. We are all hardwired to crave IRL social interaction, even the most introverted of us.

You might want to skim Sahil Bloom's book. While it might not the best at being actionable, it might make you think about the next 25 years in better context.

https://www.the5typesofwealth.com/

Don't give other people advice. They probably don't want it. They don't want you to fix their problems. Shut up and listen instead.

Every government is bad at it, it's just to varying degrees.

Be willing and able to move country will open opportunities; learn one second language to business level that will enable more opportunities.

The Sam Vimes theory of socioeconomic unfairness is real and important; have a lifestyle such that you build up a savings pile sufficient that you can afford to spend less: https://en.wikipedia.org/wiki/Boots_theory

    while (alive)
    {
        If (You are truly passionate about some hobbies or career paths)
        {
            do_not_marry_and_especially_don't_get_kid();
        }
        else
        {
            focus_on_making_as_much_$$$_as_possible();
        }
    }

Decide why you're doing things. You'll be able to pull off things you never expected, with a some deep thought and a good plan. Plan your career, your finances. If it's your thing, plan what kind of person you'll meet and share a life with. Plan to maintenance your relationships.

Plan for problems, and disasters, because you will have many. Friends will die, plans will fail, money will be lost. A little planning will help you survive those storms.

Take pictures of yourself and what you're doing. I wish I had more.