Snap is a packaging format for applications that was created by Canonical, the company that makes Ubuntu. Works similarly to Flatpak in that you just download one file and the application still then just run as it includes any necessary libraries, etc. I don't know how well supported it is outside of Ubuntu, but Flatpak seems to be more prevalent.
Cinnamon is a UI, one that should be easy to pick up for new users if they've had some experience with Windows.
And FWIW, everyone starts as a beginner!
I read Undercover recently and it shows just how far they'll go to infiltrate those groups they deem a threat. Not the right wing groups who suggest that murdering MPs might be a good idea, obviously; just those marginally to the left of Goebbels.
https://www.faber.co.uk/product/9781783350346-undercover/