Newbie looking for advice - Windows to Ubuntu

Hiya All,

I have a
NEO Z83-4 Series
running Windows, want to install Ubuntu any advice.
Do I need to update BIOS?
What version of Ubuntu is stable?

Running Ubuntu 20.04 with the cinnamon desktop theme installed and it works wonderful. Only problem is drive space was becoming challenged after cinnamon and user-related software... after some research, discovered it was Steam (2.6GB) and Google Chrome + Firefox cache storages. I moved those caches to a large-volume disk powered by the faster USB port and all is well. Have about 8GB remaining on main. System is very stable.