The whole point of the previous commands was to allow you to look at a file without dealing with accidentally altering it
Eventually you will need to alter a file, I use gedit because it is like a regular modern text editor. However, the class outline indicates I have to show you the old outdated, hard to use cli based editors so here they are
Vi or Vim
Emacs
What can I say… They suck and I try not to use them. They are counter intuitive and have a odd command setup that invites mistakes