I don't understand the server part? Is he just talking about using FileZilla, or learning to program Sql? Don't most programers know how to set up a server?

I don't understand the server part? Is he just talking about using FileZilla, or learning to program Sql? Don't most programers know how to set up a server? I'm not being mean--just curious. One other question, I'm assuming most web Coders know java, ROR and django--not just html and css?