>the home row (don't know if that's how that row of buttons is called)

the "home row" is where your fingers start out if you know how to type by touch, and it come from the days of typewriters instead of keyboards.

on a QWERTY keyboard, the home row is ASDFGHJKL; with your fingers resting on ASDF and JKL;

when they teach you to touch type, they say "put your fingers on the home row" and "home is where your fingers always return to."