Do you know why there is a line under the letters F – J on the keyboard?

Why are there markings on the F and J buttons?

You might be surprised to know that these little symbols on the F and J buttons play a big role in the world of typing. In fact, the main purpose of these lines is to speed up typing, helping you type faster without looking at the keyboard.

These marks help in typing. If the left index finger is placed on the F button and the right index finger is placed on the J button, the remaining fingers will automatically move to the correct position. It increases the speed and accuracy of typing. Furthermore, these marks help inform the typist about the correct placement of the fingers on the keyboard to begin typing.

Why are the F and J buttons selected? 

Now the question arises as to why only F and J buttons are selected. So the reason for this is the location of these buttons. In fact, these two buttons are right in the middle of the keyboard, while the buttons around them are used the most. So, by identifying this button, it becomes easier for the typer to reach other buttons.