What can you become self taught in?

Anything that you believe you can learn and are dedicated to! There is always the first master who made the craft right? So who says you can't be that first master? I am teaching myself songs I like on piano, and guitar a little bit but not as much as piano! I knew literally nothing however after about a year or two I have progressed immensely! Some of the founding fathers of America were self educated and they were brilliant! It's up to you to determine what's possible and what isn't! I say anything is! Best of Luck man!

A second language, a musical instrument, knitting, sewing, cooking/baking, exercise moves

well, I taught myself these things anyway :) if I can then you can!

Fishing

Dancing

guitar and computers