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.

I learned how to hold grudges against others.

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.

Friendship.

Maths

Typing

welding