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.