How and why? I started messing around with programming when I was a kid and I never learned typing or trained for it formally. When I started, I was just pecking with my index fingers, but since my mom and dad used a typewriter for their stuff, I was fully aware that pecking was suboptimal. They never offered any practical help with that, probably because they knew that I couldn't care less about how I type, as long as I could crank out my code. Long story short: I've developed my own technique, spontaneously. I'm aware that it's probably suboptimal, but it's good enough for me and I can't be bothered to retrain when there's so much more interesting stuff to do ;)