Linux

So I'm going to caveat this that I'm not an expert so if I get some details wrong, people should correct me.

Your ability to play games will be effected to some degree, but not as much as it used to be. Because of Valve's work on Proton, about 80% of the games on steam work. You can usethis website to check a community maintained list. Most of the remaining games that don't work are games that the developer went out of their way to not work on linux. This is usually by having an anticheat that doesn't work with linux, or not enabling linux support for an anticheat that does. For playing games not on steam, it requires a bit more effort, but there is Lutris and Heroic for that. Feel free to look into them or ask for more information.

For modding, I don't have as much experience but I have done it and you can. I think how well it works varies game to game, but then again, modding is like that anyway. One piece of advice I've heard is that if you are going to be molded, make the folders not case sensitive. This is because on windows folder names aren't case sensitive, but on linux they are. EG /Folder/ vs /folder/ are the same on windows, and by default different on linux.

For software without a linux version, you can usually find an open source or web app alternative. Microsoft Word doesn't have a linux version, but you can use Libre office, or use the browser version of it, or use Google Docs. For most intents and purposes, this is what you should do. However, you can use a program called WINE to run a lot of Windows software on linux. WINE is what Proton(see first paragraph) is derived from. Similar to Proton, there are limitations, but most come from the developer side these days from my understanding.

The good news is the .NET is on linux, officially supported. I habent checked in a while but i dont think its at 100% parity yet. And a good amount of software frameworks are also available. I've never run into a library or framework that didn't work on Linux that doesn't have a good alternative that does, but I'm not the most avid programmer so someone more experienced can chime in.

All versions of Linux have a program called a package manager, the specific one varies(apt, yum, etc), but they are the primary way you install software one linux. They are like an app store. It installs the software for you and updates it when you tell it to. Core system packages, like the kernel, are also updated through the package manager. Most of the time there is a GUI version or wrapper for package managers in case you aren't fond of using the terminal.

So this is another area where I don't know too much on, but my understanding that linux has fewer viruses and it being open source is a double-edged sword. There are fewer viruses for desktop linix because of the smaller user base. Why would someone making software to harm people not aim for the platforms with larger user bases like windows and Mac? This being said, I think there are more viruses for servers that target linux because of the dominance of it in that space. As for being open source being a double-edged sword, this means security exploits are easier to find because there are more people looking at the code. Both by those who wish to patch them and those who want to exploit them. All my friends and I don't use an anti-virus on our linux machines and just keep them up to date, but there does exist anti-virus for linux.

GPU driver are reliable in my experience, but more so for AMD. NVIDIA has proprietary drivers that some distributions don't let you install for ideological reasons, but they do work most of the time. My computer does run NVIDIA and while I have had issues getting started with the drivers its usually not a problem agyer you get past that stage. Again, AMD is better here and basically painless.

Not to my knowledge, no limux can't damage your hardware. But I'll leave this for someone with more knowledge than me.

The distro I tell beginners to start with is Mint. Installing NVIDIA drivers was easiest on that from my experience, and largely just works out of the box. It has a windows like UI but this is both a good and a bad thing. Good that it will be familiar; bad that you will sometime fall into windows behavior that doesn't make sense on linux. In the past ubuntu filled this niche, and mint is based on ubuntu, but canonical, the company behind ubuntu, has made some questionable choices.

Anyway wish you the best of luck and welcome to the linux community.