Linux

A lot of people are going to recommend you mint, I honestly think mint is an outdated suggestion for beginners, I think immutability is extremely important for someone who is just starting out, as well as starting on KDE since it’s by far the most developed DE that isn’t gnome and their… design decisions are unfortunate for people coming from windows.

I don’t think we should be recommending mint to beginners anymore, if mint makes an immutable, up to date KDE distro, that’ll change, but until then, I think bazzite or aurora if you don't like gaming is objectively a better starting place for beginners.

The mere fact that bazzite and other immutables generate a new system for you on update and let you switch between and rollback automatically is enough for me to say it’s better, but it also has more up to date software, and tons of guides (fedora is one of the most popular distros, and bazzite is essentially identical except with some QoL upgrades).

How common is the story of “I was new to linux and completely broke it”? that’s not a good user experience for someone who’s just starting, it’s intimidating, scary, and I just don’t think it’s the best in the modern era. There’s something to be said about learning from these mistakes, but bazzite essentially makes these mistakes impossible.

Furthermore because of the way bazzite works, package management is completely graphical and requires essentially no intervention on the users part, flathub and immutability pair excellently for this reason.

Cinnamon (the default mint environment) doesn’t and won’t support HDR, the security/performance improvements from wayland, mixed refresh rate displays, mixed DPI displays, fractional scaling, and many other things for a very very long time if at all. I don’t understand the usecase for cinnamon tbh, xfce is great if you need performance but don’t want to make major sacrifices, lxqt is great if you need A LOT of performance, cinnamon isn’t particularly performant and just a strictly worse version of kde in my eyes from the perspective of a beginner, anyway.

I have 15 years of linux experience and am willing to infinitely troubleshoot if you add me on matrix.

Fedora because it just works.

Put Linux on one of those spare hard drives and simply mount the existing drive as a second drive in Linux.

This will give you access to all your current files from within Linux without having to do anything. Move over what you want and need as you use Linux. At some point, you will probably want to reformat the original Windows drive for extra space. You could consider mounting it as /home at that point.

Choosing a distro is a matter of taste. I can tell you though that I have moved a few Windows users to Linux Mint and they are all happy with it. My last one was LMDE (Mint with a Debian base).

Gentoo

LFS

First, BACKUP EVERYTHING.

Then, the best distro is probably going to be the same you are currently using. You will not have to deal with issues that may be specific to one distro. There is enough difference from one computer to another to cause annoying issues, even on windows.

While I'm here, I might as well figure out one for me, I usually stick to gaming and graphic design programs since I'm an artist. but honestly I do anything under the Sun and whatever my whims fancy so flexibility is a must

A lot of folks recommending Mint Cinnamon. I agree, that's a great choice, one of my favorites. If for some reason there are technical problems, you might also try something with KDE, like Kubuntu or Fedora KDE. Also windows-like, even more mainstream than Cinnamon, faster to adopt new shit like Wayland.

Biebian.

I vastly prefer/recommend stable LTS distros. There are really 2 main families of distros for this:

1. Linux Mint / Ubuntu LTS / Debian Stable (Ubuntu is based on Debian, Mint is based on Ubuntu LTS):

Basically endless amount of packages. Most people in the linux world have some familiarity with these so it shouldn't be hard to get help if you need it.

2. Rocky linux / Almalinux / RHEL (Rocky and Alma aim to be compatible with RHEL software):

For desktop systems people usually opt for fedora, but that distro does not meet my own criteria. Biggest reason you'd use these is for professional VFX software support. For whatever reason a lot of that stuff only has official support for this family of distros. Not sure why!

Get good at 1 of these families of distros. If you aren't vibing with one its okay to switch to the other. Both have more cutting edge options if you desire them.

Linux Mint is a community favorite and very much is built with a desktop user in mind, but I don't think it's unreasonable to subject someone to learning any of the others even if they are more server focused. Everything I listed has atleast 5 years of support! If your fiancee isn't super tech literate, you'll probably be the one doing a lot of the system maintenance so keeping those major updates sparse is a very good thing. And of course, if you don't wanna learn 2 different sets of tools, try and keep in the same family of distros.

Also, for desktop environment don't choose anything crazy obscure. KDE & Gnome are most common, Cinnamon & XFCE are less common but IMO fine. Venture into others at your own peril.

Transfer process depends on what you mean. Transferring your files will probably just take time. I'm hopelessly unorganized so for me backing stuff up takes a few days of combing through a bunch of junk and copying to a flashdrive or cloud storage. Other people might have more efficient ways of dealing with this though.

If you mean software Libreoffice is great local office software, SMplayer is imo a good media player, GIMP, Inkscape, and Krita got art stuff covered. We're also at the point you can more or less run most windows software on linux with enough fiddling, but that obviously isn't ideal.

Your biggest hurdle moving to linux full time will be understanding commands when you inevitably do need to change configuration of something with the terminal. If you need help there are usually forums, IRC, matrix, etc.

Happy computing!

omnixy, a NixOS fork of omarchy (which aims to serve the best defaults) that isn't maintained by a fascist

Bazzite

Mint. it's slick, stable and similar (usability wise) to people coming from windows