Linux

Just get an all AMD (CPU & GPU) build and flash a thumb drive with Bazzite (bazzite-deck), your PC will be very similar to your Steam Deck.

I did this, best decision ever.

Using Linux since 2008 ish.... (As non IT user), I recommend going and route, and using pop os (or bazzite which people say also works well but is personally haven't tried), I am currently using tuxedo os on my laptop but my pop os journey for your use case on the home machine has been the smoothest, and if you go do route which I did, I had never thought about any driver issues.... The only thing in pop (which I haven't updated for a year now, yeah life got crazy), was that always do apt get updates / upgrades as pop OS's package manager gui used to get stuck sometimes, once the terminal completes the updates then use the GUI to update the pop os things. Other than this small hiccup, never had to do anything else. (Oh yeah when buying hardware some people told me that getting the latest and greatest cutting edge sometimes takes time for the kernel to catch up to the optimizations of drivers, but I always bought 1 or 2 gen behind the latest and never had any issues, I mostly play Indy games other than 1/or 2 like Tekken series at 2k monitor so I never cared about 4k 120 or above fps.)

Bazzite would be a great choice in my opinion. It's meant for gaming, has drivers preinstalled and is immutable (basically impossible to break). I'd suggest using KDE because it's Windows-like and is the default for desktop mode on SteamOS.

I second the recommendations for Mint. It should work out of the box. You can download the .iso file from their website and use a program called Rufus to write it to a USB stick. You should be able to plug it in, shut down windows, boot from the USB (may have to go into the boot menu in the UEFI), and it will install linux for you. This will be the same process for most linux distributions.

For installing software on Linux, there is an important difference between Windows and Linux; on windows you typically download an installer .exe and use that to install a program. On Linux, each distro has its own "package manager" which functions a lot like an app store on a phone. The package manager will install the program for you and take care of keeping everything updated for you, so if your GPU drivers, steam, or whatever else needs updating, just run an update on the package manager and it will do everything for you. Some will support automatic updates, so you may need to google how to turn that on for any given distribution's package manager.

In terms of what hardware works better, most folks will tell you to use AMD graphics cards over Nvidia, but that is about it. Nvidia still has proprietary drivers which don't always play nice with linux, but as an nvidia user myself, the problems seem to be getting fewer and fewer.

I'm going to go against the grain here and recommend that you NOT use Mint. I've been using a linux for a month now, so I'm new to it like you.

My first time trying Linux was Mint, and I didn't like it at all. There was too much crap downloaded on it, and it abstracted the underlying systems too much, so I found it all very confusing. I suggest that you download a distro that Mint is based on, and then install the actual stuff you want on it.

Mint is based on Ubuntu, which is based on Debian. I decided to go with Debian as a total noob and it makes waaay more sense to me this time around. I enjoy customizing it to my liking rather than Mint doing it all for me—often in ways I don't like.

Generally, Linuxmint is the go to distro if you want something that holds your hand, but due to your limited needs outside of gaming and already having a Steam deck you should take a look at Bazzite, which is basically the desktop mode of the Steam deck for PCs.

As for hardware, one thing that can be annoying is NVIDIA (drivers), but that shouldn’t be a major problem with these distros as mint has a built in manager that does everything for you and with Bazzite you just need to specify your GPU when downloading and don’t have to do anything.

My recommendation is download the distros you want to try, get Rufus put them on a USB and then play around with them in demo mode, make sure everything works (graphic card, printers) and if you like the distro then start the installer. If you don’t like it you can just unplug the USB and reboot without anything persisting.

Linux mint is a common recommendation but I think a bad one (for beginners anyway), I highly recommend bazzite with kde, I have 15 years of linux experience and am willing to do infinite troubleshooting if you add me on matrix (which is on my profile) I've onboarded many people and this is my experience with beginners

in short, linux mint is bad vs bazzite with kde for 3 reasons

kde is much more well supported and developed than cinnamon, it's not even close especially if you care about security

immutable distros are much more forgiving for new people, immutable means that the core OS can't be modified.

and finally bazzite has more up to date software, linux mint is a "stable" distro, stable in the linux context means unchanging, not unbuggy

if you don't know what any of that means, go bazzite over mint, you'll have an easier time.

Try Bazzite:

https://bazzite.gg/

It will give you an experience that's familiar compared to the Steam Deck, and everything will "just work" out of the box.

It already has Steam installed and is a great desktop for general use.

I run Linux Mint for years and years, I think you will be happy with it.

I recently made the switch back to Linux, to Pop! OS, and I've never had such a smooth experience before. It's currently using GNOME as its desktop environment, which I find a bit shit in general, but they've modified it enough so that it's user friendly and intuitive. It has an "app store" as well that you can use to check for and run updates, search software etc. If you have a big screen, the window tiling function is awesome. Highly recommend you have a look at it!

I really like fedora out of the box but if you’re used to windows some will recommend Linux mint. In fedora there are a lot of packages installable via the software store as well as downloading app images and RPM files.

I'd just recommend against NVIDIA GPUs if you don't want to tinker, I'm sure it's not as bad as it was back when I had NVIDIA cards, but faffing around trying to get NVIDIA drivers to play nice was the bane of my existence (and where I was forced to learn the most about Linux).

Oh and the screen tearing was a nuisance too that went away as soon as I got an AMD card.

Looks like you got lots of great advice on the OS. Good luck, and enjoy whatever you end up doing!

Pro tip is to install a virtual machine like virtualbox or something on your Windows system. They're super easy to set up with loads of tutorials on youtube.

From there you can install any number of linux distros (I recommend Mint or Pop!) and try them out without having to commit to real hardware. I would put the VM in fullscreen and pretend it was a real system, and use it as my dedicated machine for as long as possible. You can even install steam to get a feel of the setup process (bear in mind you'll need to set up stuff for graphics acceleration to play most games but the basic setup should be fine!)

As for setup. Most Linux distros are as easy to set up as Windows or MacOS: USB in, boot, select a few basic options and stick to defaults. Reboot. Install stuff. You don't even need to deal with drivers (even Nvidia is cared for by most installers) which was nicer than burrowing through NV/AMD's websites to get their driver installers set up.

At that point you won't be wondering if youve made the right choice when it comes to your next build, and you can get right down to actually using your PC instead of googling things. Good luck!

is there a Linux… idk what to call it, type? OS? Thing??? that runs out of the box without me having to install additional software manually or at least automatic setup wizards

The word you are looking for is called a distribution, or distro for short.

I'm surprised no one else has mentioned Bazzite, which should be exactly what you're looking for.

is there any specific hardware that works easier with Linux

An AMD GPU for sure. Nvidia drivers have come a long way, but they don't generally behave as well out of the box like AMD.