With snaps and their weird approach to software management in general. I don't have any idea which mainstream distro with KDE I could recommend since Mint doesn't offer an official spin and Fedora doesn't have the same LTS release cycle as Ubuntu.
So I'm kind of at a loss here, as there don't seem to be sensible beginner distros anymore.
Do you know what the word 'example' means? There are people who aren't as superbly knowledgeable as you are.