Back in 1996 I had a website running on a shared unix of some sort. I could barely upload files in the correct binary/ascii mode, or copy and paste a “chmod” command.
My 1996 self would be the exact nightmare wordpress user today, although I guess I wanted to learn even though I didn’t know what I was doing, which is different to many comments I’ve seen on places like GitHub.
And, perhaps other than knowing about permissions, you don't really need any Linux knowledge to use these hosts.