Ahhh, it seems like you're experiencing the dichotomy of Linux. The best part about Linux is the community, and the worst part about Linux is the community.
I've been using Linux off and on for over 30 years, and have been using it full-time for the last 7 or so. I'll try to cut through some of the elitist bullshit out there and answer your questions, and hope it helps.
Distro: Honestly, what really makes a distro a distro (from a new user perspective) is the package manager, and the DE. Yes, I know you can change the DE, but a new guy won't. I would try a bunch of distros in a Virtual Machine and try out the various different package managers (apt, yum, dnf, etc) and see which one clicks. Of course, this is only going to be used at the command line, but at some point - once you get your feet under you, you'll be using the command line. I prefer apt, therefore, I use an Ubuntu based distro.
Gaming: Honestly, it's hit or miss. A lot more hits as of late. However, if you're into online multiplayer games that enforce a kernel level anti-cheat, you'll be sorely disappointed. Look at protondb.com and look up the games you play, and see how well they work. If it's silver or better, you'll probably be happy with it.
Nvidia: This would tend to get into the weeds. AMD has native drivers in the kernel. Plug and play, unless you want to install proprietary drivers for Machine Learning, and even that can be a hassle sometimes. Nvidia has open source, but not great. Their proprietary drivers are better, but the compositor may cause problems.
Dual Boot: If you do (I do), do it on a separate drive. Microsoft can fuck with your bootloader if it's on the same drive. I've had no problem dual booting.
Easy to Learn: Depending on distro and hardware, you don't really have to know how to do anything other than install via a usb drive. You can do everything with a GUI if you want. It's not like you have to jump in feet first, set up a VM and play around.
Everything works OOB: This is mostly true. However, it is important to understand that most stuff's drivers are written for Windows. As you build/buy hardware, you'll get used to looking to see if it works with Linux. Some stuff does, some stuff doesn't, some stuff needs some "hacking" to get it to work.
I love Linux, would love for you to join us, but if you're getting overwhelmed, I can understand. I would start fiddling with them in VMs, see if you even like the idea of it. After that - start looking at your hardware and see if it works with Linux and you want to go bare metal - go for it. But keep your windows drive ready to swap in. Eventually, you'll be calling guys noobs and bitching about them not reading the Arch wiki... :D
10