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. 
Libreoffice and Firefox are the biggest offenders (they both open the GTK file picker instead of the KDE file picker on Plasma). Very annoying but it's solvable.
yeah exactly like, these widely used, major apps have significant breakage that requires manual tweaking by the end user. It's frustrating and makes me very reticent to recommend flatpak across the board. If anything little apps that use flathub as their primary distribution channel are more likely to maintain their package well and use its features effectively lol, big orgs/companies don't put in the effort/take it seriously, or don't provide a flatpak at all resulting in unofficial ones which vary in quality.
Which sucks because I actually do like flatpak mostly. it's pretty much essential for my phone setup