If you're single, dating. Especially online dating. Depending on you upbringing, this is similar to personal finance, where nobody really teaches you what to do, and there's a lot of "seduction" or "red pill" toxic nonsense out there. Dating is also a relatively recent modern construct, and it's a skill that doesn't come naturally. There's a certain etiquette to it that might vary from place to place and in time you're in. But generally, it's about keeping it simple to start out with, getting more adventurous as dates progress, and being assertive, organized, and clear in your communication, while trying to forge a genuine connection with someone. It can also equip you to handle other emotional rollercoasters you might encounter.