TL;DR: A step-by-step installation of Linux Mint on real hardware and setting it up for typical gaming tasks.
I don't really care much for SOG's other content but his forays into Linux over Windows were incredible for demystifying the operating system to a mainstream audience (i.e. people who watch his content).
Some nitpicks:
- Muta should have used the flatpak version of Steam instead of the system package, the Steam client updates itself (with its own runtime and all) so using a system package over just sharing with flathub is a bit wasteful (it does complicate external storage devices a bit since you have to manually set permissions via flatseal but that's it). (Edit: this is just a small nitpick, the native system package is fine as well).
- There should also have been mention of Bottles over installing Wine as a system package as well as things like the Heroic Games Launcher for GOG and Epic Games titles, Lutris is fine though.
- On long term stable release systems like Linux Mint or Debian, Flathub (or foreign package managers like Nix/Guix) should be your go to for installing software, let the distribution itself manage its core system components which I wish he clarified when he saw Flathub taking multiple GBs on first download.
Other than that, Linux stays winning. 
wow, I haven't thought about synaptic in years! throwback! I did always find it a nice, functional option. If I hadn't made this shit a career and spent probably years of my life at a terminal, I might still be using it. It's literally better in almost every way than its successors, and its lightweight to boot... I guess that's what you get if you try to build an apt GUI, rather than try to make a flashy clone of the app store and just happen to use apt as the backend lol.
The problem I guess is that people need to learn how to use it. What even is a package? a repository? why does it say Amateur Radio? etc... But I don't think that's really a huge problem. Better to have functional stuff with a learning curve than intuitive stuff that's always broken and not very powerful.