Slackware's package manager is extremely easy to use:
slackpkg upgrade-all upgrades all installed packages slackpkg install-new installs all packages that were added to the repo slackpkg clean-system uninstalls all packages that were removed from the repo
Yeah for NVDIA you either wanna use a distro that bakes it in (Bazzite, PopOS) or hop over to tge command line and install the drivers there, e. g. Fedora:
Fesora shows a popup on first boot along the lines if "click here if you need NViDIA drivers." If you install an Nvidia GPU aft the fact you have to search for it, but there is a GUI.
Arch-based distros do have the nvidia-dkms package available, works great in my experience.
Linux Mint and Ubuntu got a dedicated driver utility for this.
Debian provides a "nvidia-driver" package.
OpenSuse provides it via YaST, or manually in a dedicated repo.
Does it work as good as having the driver pre-installed? Hell no, those nvidia drivers are gosh darn awful in nature. We can just hope NVK can completely replace them asap.
Until now I have used Ubuntu, Mint, both Opensuses, Arch, Endeavour, Fedora, Manjaro, and Gentoo
And not a single time did I have any problem installing any of these
Also, if youre new to linux and encounter a problem, you should first consult the forum of your Distro. Those people can actually help you find out the problem youre having and Open a bug report or expand the Wiki with your edgecase and the appropiate way to solve it. But going all Heuli Heuli on everyone instead of actually submitting bug reports is the most unproduktive and childish way to solve the problem you (and probably a few more people in the future and past) have had.
Here's what I learnt the hard way... if you're having a problem, don't go the hard way, it's likely something extremely simple you missed, check the gui, restart your computer, at most reinstall some packages (either through gui or cli)
I could be that jackass that says "well your first mistake was buying x when you should have bought y." I'd be correct, but it wouldn't be helpful to anyone actually trying to deal with this kind of problem.
I'm still "new" to linux myself, despite attempting to use it several times over the years, so I don't have any actually useful advice. I can however say that linux mint (after getting it installed and updated and upgraded and updated again), runs flawlessly on modern AMD hardware. The package manager even has a gui!