All kinds of things really although mostly they're on my list to learn so I'll have them one day. Tatting might be my main one for 2024.
(Edit: Forgot the "why". Mostly because it's come up twice lately here on Lemmy and I feel left out while other people are making pretty lace)
I do wish I could learn to draw a bit better, to play the piano, and to speak multiple languages. But realistically I don't have that kind of time so have to go with things that are quicker to pick up!