Not comprehensive, but do this and you'll be light years ahead of everyone else your age (in order of importance).

Learn how money works, I don't mean how you buy stuff with it, but how money and debt actually work. If you get this squared away now you'll be better off than 80-90% of everyone else, it does taking a bit of a more pessimistic (realist) mindset. If you don't know where uncollectable financed debt goes or how financial instruments work to lower your monthly costs, or how your wages compare year over year in real purchasing power (i.e. whether you are making less the longer you stay at a job) then you don't know enough. Most people fall into a usury trap set by predatory banking institutions at some point.

Always risk manage big decisions and figure out what the ROI is for those decisions ahead of time. Do your research. Have a plan of action before you do something that locks you in for longer than a year. Don't trust the salesperson.

If a college degree you are interested in doesn't have a good ROI, don't major in it, or consider traveling internationally to a school where the ROI makes sense. You need to have your education paid off by the time you are 28-30 without outside help and promises of jobs at graduation are often fluff, consider the risks as well (are there hidden factors that might prevent graduation within a time period just as an example).

Learn how to negotiate, constantly determine whether they have credibility. If you are too agreeable you can't leverage the things you'll need later, and there is no basis for further negotiation when one party lacks credibility. Being able to walk away is valuable. Don't get caught in a circular logic trap, you decide what you want to do and no one else, you don't need to explain why because if they can't respect the decision then you have nothing to talk about because they've lost credibility.

Don't get taken advantage, your time is valuable, many people in their 20s discount their professional experience and subsequently get paid much less, or worked more; most places take advantage at some point unless you reasonably push back, as an example this can include sudden changes to shifts where they know you have prior commitments but they call and ask anyway (i.e. classes). Be wary of illusory promises as well and learn about the psychology and tactics you might face from these influencers. Understand Burnout and what you need to do to fix it.

Learn how to communicate effectively in writing at a professional level. Spelling, grammar, punctuation, and word choice all affect interactions. People will treat you differently based on how you present yourself (that includes appearance, odor, speech as well).

If you make a mistake, own it. Ask questions, improve, don't own/accept something that isn't your mistake.

Learn how to effectively learn and build the long term habits you'll need later, whether that's adjusting your diet or something else. (hint, don't give yourself the choice whether you follow through but have criteria/rules for exceptions and understand attention is finite, do what you need to structure the change accordingly).

Learn how to deal with liars and how to hold them accountable and don't lie. Almost all interactions moving forward will have some small lie where they can't easily be held accountable (Document details, memorialize, in writing, case-build, who you spoke to, when, what, etc) and fight for the rights have. If you are working to deal with an issue, realize what people can and can't do at various levels. Customer support, corporate, overseeing regulatory body, congressional representative that supports or oversees the area.

Build Discipline and other habits which make doing new things easier.

Be able to defend yourself, take Brazilian Jui Jitsu as a starter (this builds discipline), then some firearms training to understand how accurate guns are and how they work and are used.

Be able to survive, know how to start a fire that burns 8 hours without attention (putting a log on) and what you can and can't eat, how to prepare emergency food that doesn't need refrigeration, and what kind of preparations you need if the supply chain breaks down for necessities (shelter, water, food, safety).

Spend some time at the library reading up on historic events, everything happens in regular cycles, knowing and preparing to capitalize on certain events can ensure your safety and future prosperity. Also, most of the history you learned in high school if its US based is likely a biased narrative and useless, in many cases it may not even be all that accurate (i.e. Panama, West/East Berlin, Latin America 1950+).