Can I partition /home directory in a different drive and still fuction?
Yes, that is the recommended thing to do.
Transferring /home directory without reinstalling Linux?
Not a problem, just format your other partition and add/change an entry on /etc/fstab, next time you reboot the home will be in the new partition. For how to write this line check out how the other lines are written, it’s essentially the UUID of the partition (or sometimes it’s name, but that’s discouraged since the name depends on the order the drives are plugged), some options and the location to mount the partition. Should be straightforward to copy the one for / to write a /home one.
Best way to partition my / and /home directories?
Just format your partition and add it to fstab. The other things are for doing the same with other folders.
Fedora KDE refresh rate seems broken?
Nouveau is not great, NVIDIA is a shitshow and hamper open source development actively, but their proprietary drivers mostly “work”, so I would just install those.
Downloading NVIDIA drivers on Fedora KDE?
No idea, they should be in the package manager though.