Extensive listing of places to find key information such as your User UUID/GUID, Ethernet MAC, model identifier, and much more.
UUID
What’s a UUID, and a UTI? What can you learn from each, and where can you look them up? Important info about these, and a new release of a tool to help.
Should you worry about Apple and all those UUIDs? Some claim that they are being used to track you and what you do on your iPhone and Mac.
If anyone recommends that you change the Advanced Options for a user, please read this first. It could save you a lot of pain and grief.
Has someone hacked into your encrypted drive already, or is this another security vulnerability in High Sierra?
They’re almost everywhere now: UUIDs and GUIDs identify disk volumes, printers, even the processes running on your Mac. Here’s an explanation.
How can you tell whether your Mac supports Continuity, whether you bought an app from the App Store, and diagnose extension problems?
The Eclectic Light Company 