Yeah. Lots of stuff. How to cook, how to sew, CPR, basic first aid. I was certified as an EMT at a program there. There are other things I learnt that help me now that I'm in university. Biology, chemistry, physics, maths, economics.

Edit: Honestly, if you didn't learn anything "useful" in high school, I don't know what you were doing, lol.

maths. need it all the time with my studies

Yes I did. I learned a lot everywhere it’s just my nature.

Of course, high school was where I learned essentially all my basic education. Like, most of the stuff I know about things that aren't relevant to my chosen field of study came from high school, e.g. basic history, literature, how to write properly, and so on.

I learned how to hold grudges against others.

Friendship.

Maths

Typing

welding