I planned to learn React and modern JS/Web dev (had been doing iOS/Swift dev.) Instead, my dev. manager left and, since I was the most senior person on the team, I was given the job.

So, instead of learning React, I learned that I kind of like dev. management, or at least some parts of it. I also learned that I like traveling for work. I would never have thought that this would be so, but I was encouraged to try it and to my surprise it's working out well.