i learned through lots of aim fights. considering I'm only a teen now, i got really into computers at 4, simply because they were in my blood. I didn't do much typing until about 10, and over the years I've gotten faster. I don't have super great accuracy, but I wanted to be like my older siblings who I thought could type an essay in a minute haha.
lots and lots of practice. and lots and lots of trial and error. I still can't get a touchscreen right, but I'll get there someday. I need the physical keys to know where my fingers are, and all my touchscreens have different keyboards. gah