Lots of people (particularly people associated with LessWrong) are telling me I should become a computer programmer; in response I've taught myself a little Python using this site, written a couple Python scripts on my own, and just now sent in an application to App Academy. But if I don't end up going to App Academy, what's the best way to develop some actually marketable programming skills? I've heard people recommending getting involved in open source projects on Git Hub, but when I looked at Git Hub I found it overwhelming, with no idea of how to find a suitable project to work on. Advice?
I've gone and done 20 problems on Project Euler, and learned a little, but it didn't seem like the fastest way to learn. Some of the problems took me awhile, but mostly they could be done with things I already knew. There was just one that I had to resort to Googling how to do, which led to learning a bit more about Python's max command. But maybe I should take most of Project Euler seeming relatively easy as encouragement?
Learn math too, to understand data structures, graphs, algoritms and all the basic CS stuff.