Learning outside of work hours; should you keep in the same area as your current employment or broaden your knowledge by studying a different area?

What's your thoughts around what you should work on outside of work?

Do you think you should continue working in the same area as you do in work to get a better understand, so that could possibly push you up the ladder at your current job? Or would you work on something different and expand your knowledge in other areas?

I'm a software dev and I enjoy learning and having a problem to solve. When I come home, and have time to learn something, I tend to do a course in an area that would benefit my current job, however, I do see what could be a positive in doing something totally different.

What are your thoughts?