You can start ae by giving it the name of a file to edit, like so:
$ ae filename.txt
This will bring up an editor screen. The top part of this screen
provides some quick help; the bottom shows the file you’re editing.
Moving around in this editor is simple; just use the arrow keys. You
can save the file by pressing C-x C-s and then exit the editor by
pressing C-x C-c. Once you feel comfortable with the editor, you can
press C-x C-h to turn off the help. That’s it! Knowing this will let
you do basic editing. For programming or more detailed editing work,
you’ll want to investigate other editors as discussed earlier.