Typing is the act of writing using a keyboard. If you're sick of writing out your English papers by hand, you might want to take a typing class.
Back in the 1880s, typing meant writing with a typewriter. Today, typing is more likely to refer to entering text on a computer or smartphone. When you're typing, you can use the "hunt and peck" method, in which you push keys one at a time while looking at the keyboard. A typing teacher can help you master touch typing, in which you memorize where each key is, use every finger, and don't need to look at the keyboard.