Machine learning. Very broad and educational. It'd take 15 minutes, then 3 weeks to learn Swift, and then all you'd have is another language you're familiar wit

Machine learning. Very broad and educational. It'd take 15 minutes, then 3 weeks to learn Swift, and then all you'd have is another language you're familiar with. Actually scratch that. Go long on machine learning WHILE ALSO skimming through Swift docs such that you'll be familiar with both.