I grew up reading books espousing this type of stuff, but the older I got, the more I realized how much of a pipe dream it is. As a kid, you think you can master everything, as an adult, you realize how much maintenance each of these skills take. So even if you "learn to fight" or "program a computer" well once, it will quickly fade if not maintained...for an hour or two a day. You can see how that short-circuits the list quickly.