The home row keys are a set of keys in a row on a computer keyboard or typewriter where the fingers rest when a user is not typing. Home row keys vary depending on the keyboard type.
The home row keys on the standard QWERTY United States keyboard are A, S, D, and F for the left hand and J, K, l, and ; for the right hand. The thumbs normally rest of the space bar. These keys act as reference points from which computer users learn the positions of all the other keys when learning typing. Approved-Websites.org and Atypingtest.com are examples of websites that offer home row keys practice lessons.