Seconding cooking for sure. You have to eat, so you might as well find a way to enjoy it, save money, and stay healthy in the process.

Repairing things. Electronics, clothes, furniture, it doesn't matter what, but try to learn how to repair stuff. It eventually encourages you to buy less, but higher quality items. Also everyone likes if you fix their favorite thing.

Organizing people. This isnt often treated as a skill, but it really is. You'll find over time that in your group of friends, someone is always the person to try to put together the next activity. Try to be that person. That's super useful in all parts of life. Keep in mind that people will end up being lazy and expecting you to keep doing the work, but try not to take it personally.