position: “lower_third is missing a comma at the end

Yes, I can imagine that.
I guess the mirror glass is mounted directly on top of the frame, right? I cannot see any ventilation drills. Did/do you somehow monitor heat inside the frame?

I’m impressed. A nice and clean build, well written documentation, some nice pictures to look at and everything with markups and such. Very well done, this is how more Showrooms should look like :)

Interesting approach, so it integrates into your existing set of light switches, power plugs, etc

What kind of display did you use? An old laptop display?

Your cloned MagicMirror folder resides in /root, but it should be /home/pi

User pi does not have rights to do much in root folder.

You are logged in as pi, right?

Try this please

cd ~
git clone https://github.com/MichMich/MagicMirror
cd ~/MagicMirror
npm install
npm start

You are running very old versions of npm and node. I am on my smartphone and cannot run a search on the forum for you, but you should be able to find similar posts with resolution

the file needs to be config.js, the existing file config.js.sample is just a sample and will be ignored

That’s a bad question, as I cannot answer that. I don’t have any mac available, so I cannot test it.
I don’t know if this is an unwanted feature - in this case - of the editor or of the entire operating system. On Windows I use “notepad++”, I’m sure there is something similar for Mac.

The problem with your code is, as with several other people (mostly on macs) wrong quotation marks.

{
module: "PushBulletNotes",
header: "iPhone Messages",
disabled: false,
position: "bottom_left", // Or any valid MagicMirror position.
config: {
	accessToken: "o.(middle bit left out)i",
	numberOfNotifications: 5,
	showNotificationIcon: true,
	showMessage: true,
	showCount: true,
	fade: true,
	maxMsgCharacters: 50,
	maxHeaderCharacters: 32
	}
},

Look at the quotation marks. Left is correct, right is using wrong ones. I think this is a problem with Mac keyboard or mac software.