The tutorial doesn't tell you much. It just says "run that command, then another command etc.". Where's the explanation?
I agree, the tutorial obviously expect you have some knowledge/experience on linux administration.
As I said, I have a VPS left over and I'd like to "donate" its operation to the electrum community instead of having it shut down. I also like practicing in this field. I'd have probably given up with this setup, but it seems that I'm a stubborn...
Honestly if the VPS use linux, you can use easy installer/docker (which i mentioned above), which is very easy to use.