Why are there these 2 lines on a computer keyboard? 90% people will not know, do you know the correct answer?

05

The middle row of the keyboard is called the home row. If you place your left and right hands on the F and J keys, you will find that you can easily reach other buttons. By placing your hand here, it is easy to cover the keyboard up-down, right-left. Your fingers easily cover A, S, D and F, while the fingers of the right hand cover J, K, L and (;). Both thumbs reach the space bar.