As Al pointed out, vi and Vim (henceforth Vim, because it’s got some neat extras that I really miss in plain-old vi) use the concept of modes. There’s “insert mode” where you type text.

Vim is a powerful, keyboard-based text editor that can seriously boost your productivity - if you know how to use it. In this 100-second crash course, we break down what Vim is, why it’s still loved ...