How it works
Your fingers rest on the home row, the middle row of letter keys. Every other key is a short reach from there.
The left hand rests on a, s, d and f. The right hand rests on j, k, l and the semicolon.
The f and j keys each have a little bump. Your pointer fingers feel for the bumps, so you can find home without looking down.
After a trip to another key, a finger always goes back home.