There are some evergreen computer topics, like SQL, and bash, design patterns. I focus on those rather than the latest Javascript library. But otherwise, I really want to focus on things which help me give back, communicate, or understand the world better. For example, I am studying Latin because it helps me understand the deep history of humanity, and of languages, and the evolution of thought and consciousness. I practice guitar because I realize that music is all about communication and creating special, authentic experiences. I love to get outside, and I am more interested in geology, botony, and the birds and the animals than I ever was. Because those things are deep and unchanging.