Basically, they're using a custom auto-tiling desktop called Hyprland. When you install it, all you get is a wallpaper and a terminal app. Hyprland is mostly known for having fancy and customizable (if you know what you're doing) animations, so it looks even prettier in motion.
nice! i've been toying with the idea of dual booting for a while so i'm thinking i'll make it a weekend project. yes, i'm doing this primarily for the aesthetic lol
If you wanna use hyprland though, and you've never used Linux before, that's gonna take more than a weekend. If you want a highly customizable desktop that you can still do over the weekend I'd highly recommend starting with KDE Plasma, and going with Fedora as a distro if you don't want to have too much grief with the install (though if you want an easy to install version of Arch, which will probably include some terminal usage for installing apps, starting services etc, EndeavourOS is pretty great as well).
Both of these distros let you do dual booting pretty easily as well AFAIK
yeah, luckily my partner is a bit of a linux buff so they can help me. they advised against arch which i'm going to take their advice on, so i'll explore other versions (distros?) before i commit.