Oh yeah. Music is one of em. Never learnt how to read sheets or much of anything about music theory. I mean, I only just learnt how time signatures work. I play the guitar sort of okay, and have a decent ear. But everything I've learnt has been by feel, and I really want to properly learn theory. I want to know how the circle of fifths works, how polyrythms work, etc. like, I have a feeling of how they work but I couldn't really talk about it at length and I'd have a hard time figuring out why a section of a song sounded interesting. I dropped that desire some years ago, but with every new artist I discover I'm trying to break down how the music works in my head and often come up short.

Carpentry is another. Ever since I started playing guitar I wanted to build my own guitar from scratch. Then I took some industrial design classes in college and it cemented my interest in it. During lockdown I bought some tools but got distracted with other fleeting interests. Once I have enough space for a workshop, I'll get on that.

Lastly, storywriting. Whatever I write, it feels like it'd be at home in a technical manual. Regardless of what language I write in, it feels stilted and sterile. I've been working on this one lately though. I'm DM'ing a campaign with a ton of homebrew and wrote and designed a 70 pages long handbook for my players. The ones that took the time to read it really liked the flavour and worldbuilding I did, so, progress.

Edit: forgot one, mead, and spirits in general. Made one batch years ago, with apple juice, cinnamon, and cloves. It was good after about 2 years. I still have a 2L bottle in my closet. At this point I think I should just bin it. For a time a friend and I were talking about making large batches of it and selling it on the DL as party drinks. Pineapple mead, mango mead, etc.