Also you put two point 14. And the first one is missing a step and there is a a space missing.
cd ~/MagicMirror should be cd ~/MagicMirror/modules and ~MagicMirror/modules/ $ gitclone https://github.com/NAMEOFMODULE should become ~MagicMirror/modules/ $ git clone https://github.com/NAMEOFMODULE
But maybe instead of https://github.com/NAMEOFMODULE maybe it would be easier to say moduleUrl or something ? because the url doesn’t onlt content the url of the module but also who did it. So if somebody who never used git before try to write https://github.com/MMM-AlexaPi for example, it will fail. because part of the url is missing.

Like any other ‘project’ the person assumes the responsibility to have some knowledge or the ability to go find that knowledge. The people that created this understood what it all meant and yes newbies may not but they must also be prepared to learn to expand their own knowledge base.