On Linux systems, there are an astounding amount of plain text configuration files that determine how the system and various services behave. As such, it’s important to know how to create and edit them. When I was first starting out, I used nano because it was familiar and simple to pick up; although, while many people use nano, I now prefer Vim. Vim is arguably more difficult to learn because it’s not intuitive; however, once you get used to it, I believe it has a lot of useful functionality to offer.