Linux

Will my ability to play games be significantly affected compared to Windows?

Depends on what you play. As a general rule I would say that unless you like competitive multiplayer games you're probably going to be fine. That being said the vast majority of games don't support Linux natively so you need to use workarounds. Steam has a workaround built-in, so if most of your gaming is through Steam it should be an almost seamless transition (all you need to do is enable a checkbook in the settings). But like I said, it depends on what you play, I recommend you check out https://www.protondb.com/ and look for the games you play to see how they run on Linux.

Can I mod games as freely and as easily as I do on Windows?

Same answer as before, if the game runs okay then modding it would also work okay, but if not it might worsen an already bad situation. Also be very careful here, because when you run Windows games on Steam they're sort of sandboxed, i.e. they're running isolated from other stuff, so installing mods is not as straightforward as it would be on windows where binaries are installed globally. It's not a big deal, but just the other day someone was complaining that they installed a launcher needed for a game and the game wasn't finding it and this was the reason.

If a program has no Linux version, is it unusable, or are there workarounds?

As a general rune there's a workaround, it's called WINE (which is an acronym for WINE Is Not an Emulator) which is an "emulator" for Windows (except it's not really an Emulator as the name implies). Then there are some apps built on top of that like Proton (which is what Steam has embebed) that include other libraries and fixes to help. It's not perfect, but unless the program is actively trying to detect it or uses very obscure features on Windows it should work.

Can Linux run programs that rely on frameworks like .NET or other Windows-specific libraries?

Yes, you can use WINE like mentioned above to run Windows binaries that use .NET, but also .NET core is available for Linux.

How do OS updates work in Linux? Is there a "Linux Update" program like what Windows has?

Oh boy, this is the big one, this is the Major difference for m Windows to Linux. Linux has a thing called a package manager, ideally everything you install gets installed via that package manager. This means that everything gets updated together. And here's the thing, we're not talking OS only stuff, new version of the kernel (Linux)? New version of the drivers? New version of Firefox? New version of Spotify? All gets updated together when you update your system. This is crucial to the way Linux works, since it allows Linux to have only one copy of each library. For example, if you have 5 different programs that use the same library, in Windows you'll have 5 copies of that same library, because each program needs their own in the specific version, but in Linux since they will all update together it's easier to have just one library that gets updated together with the programs. This makes maintaining Linux a piece of pie in comparison, just one command or one click of a button and you're all up to date with everything you have installed.

How does digital security work on Linux? Is it more vulnerable due to being open source? Is there integrated antivirus software, or will I have to source that myself?

As a general rule open source programs are more secure than their counterparts. Closed source programs always remind me of Burns going through several security measures, that sort of thing is imposible in open source because if everyone can see all of the security measures, so someone would notice the gaping hole in the back, whereas in closed source only attackers might have found it. Like cyber security experts say: Security by obscurity is not security. As for Antivirus you don't need to worry, Linux is inherently more secure than Windows, and also has a small enough user base (most of whom are security experts) so the number of virus written for Linux is extremely small. Also because you should install stuff through a package manager it's very difficult to get someone to download a bad binary since there's lots of security in the package manager to prevent this sort of thing. In short almost every antivirus program for Linux checks your computer for Windows viruses to avoid being used to store or transmit viruses to Windows computers, so it's completely pointless in your home machine (it's used for example in email servers).

Are GPU drivers reliable on Linux?

Yes... But actually no. It depends, if you have a relatively modern AMD GPU (as in last 10 years) the answer is a resounding YES, AMD currently has wonderful Linux support and their cards work excellently with drivers being fully open source and integrated into the Linux Kernel. For Nvidia the story is unfortunately not as nice. Essentially there are 2 drivers available, nouveau (open source driver written by the community and purposefully hampered by Nvidia) and nvidia (closed source driver written by Nvidia that has gaping incompatibilities with Linux). Since you game your only option is nvidia, while nouveau is great for several reasons it can't match the performance of the nvidia driver. For 99% of stuff the nvidia driver should work fine, but I haven't had good luck with getting Wayland to run on it, which means you're probably stuck in X11 (I know this doesn't mean much to you, but in short it means that you're somewhat limited in your choice for graphical interface and have to use stuff that people are trying to deprecate but can't because of Nvidia)

Can Linux (in the case of a misconfiguration or serious failure) potentially damage hardware?

Technically yes, so can Windows by that matter. But realistically no, unless you're writing your own kernel drivers you won't be in any position to cause hardware damage.

And also, what distro might be best for me?

I would probably go with Mint, it's beginner friendly and I've been recommending it for decades. One thing to bear in mind is that in your knowledge level the distro you choose won't make that big of a difference, try to pick something beginner friendly and you should be fine, no need to overthink this.

PS: some extra notes that you didn't asked but I think are good to know:

• Any Linux can look like any other, it's just a matter of installing the right packages
• You should keep your / and /home in separate partitions, this makes it possible for you to reinstall (or even change distros entirely) without losing your files and configuration. This is due to how Linux manages partitions, which in short is not like on Windows where you have a C and D drives but instead any folder can be a different partition or disk.
• You can dual boot, i.e. have 2 OS and choose which one to use every time you turn on your computer.
• You should probably install Linux on a virtual machine first to check it out safely. And do a backup before installing it on your computer just in case you make a mistake.