Linux

You will have a better time with an all amd system (amd cpu's are just currently better, and amd gpu's are more linux friendly)

Every game that I played on windows, I can also play on linux

Build your pc with at least 2 drives, with 1 drive ideally just for the operating system. Not the end of the world if you cannot afford that, but it does make things easier long term, the same applies to windows installs.

Ignore anyone who tells you to use mint as your distro, they are either trolling you, or trolling themselves, it's trash.

Don't expect to find the distro that suits you straight away.

Don't judge all of linux based on the choices you initially make.

Don't listen to trashtubers like linus

If you are coming from windows, the desktop environment 'kde plasma' should be your first choice (as opposed to gnome, xfce, cinnamon etc etc)

In addition to what other people have said, don't sleep on Intel gpus, they're great and they have great Linux compatibility. Even as vgpus for VMs.

Get more RAM than you think you need, I know it's expensive, get more than you need.

I do everything through virtual machines, so I have a Linux gaming virtual machine that gets the GPU passed through to it directly, and I have a Windows gaming virtual machine that gets the same GPU passed through to it. Both work fine, some things work better on one than the other. Anti-cheat is annoying especially in a VM. There's a ways to get around it, but if you can't or you don't want to, you can dual boot the machine directly into Windows. To make that easy simply have a full nvme drive just for Windows or Linux gaming if you want, and then boot directly into it when you need to go bare metal.

That covers all my gaming use cases, so Linux gaming VM most of the time, Windows gaming VM sometimes, and bare metal windows on occasion.

The benefit to using VMs, you can snapshot them easily, you can roll things back, you can limit the damage of bad games or mods you don't trust, you can have multiple things running on your computer at the same time. If you're running a game that doesn't need all of your CPU all of your RAM, they can be doing productive work as VMs, or when your not gaming the GPU can be doing stuff like jellyfin transcoding.

I don't get the hate against Nvidia GPUs.. i have been using Linux for 3-4 years on PC and Laptop with RTX 3000 and 4000 series and it just works. Even with Cuda. Apt or pacman just give you the right driver (havent tried other package managers..) I understand there were problems, but is it really deserved nowadays? Just go with whatever gives you the best price/performance?

Don't you already know because you switched from Ubuntu to fedora or something last month?

I see a lot of bazzite recommendations but I think that is an outdated take. IMO CatchOS is the better choice, ofc this is personal opinion.

If you're ok with inexpensive entry level gaming performance, you could get one of the AMD BC-250 boards which is essentially a Playstation 5 for a couple hundred bucks. Last I checked all disabled CPU and GPU cores can be unlocked.

try to have only one graphics card or something that can "mux" properly on linux.

try not to have secureboot for the Mobo.

EDIT : Check the driver compatibilities for all your components.