Opensource.com - https://opensource.com/article/18/1/top-11-vi-tips-and-tricks
The vi editor is one of the most popular text editors on Unix and Unix-like systems, such as Linux. Whether you’re new to vi or just looking for a refresher, these 11 tips will enhance how you use it.
Editing a long script can be tedious, especially when you need to edit a line so far down that it would take hours to scroll to it. Here’s a faster way.
The command :set number numbers each line down the left side.