In agreement with bm. The domain (eg google.com) handles many services and the www kind of says which service it is using (www, mail, smpt, pop, ftp...). Of course, as www traffic is probably the most common kind, servers will most likely know what is expected, and act accordingly. Many servers are configured to redirect traffic from (eg) google.com to www.google.com. One reason for this is ...
Edit: to answer your original question, yes, any member of www-data can now read and execute /var/www (because the last bit of your permissions is 5 = read + exec). But because you haven't used the -R switch, that applies only to /var/www, and not to the files and sub-directories it contains. Now, whether they can write is another matter, and depends on the group of /var/www, which you haven't ...
Enable write permissions for the user logging in thru WinSCP. There are two ways to do this. The first way is to change the permissions on the folder to allow anyone to write to it. This isn't the best security. chmod 777 /var/www The second way is to add your user to the group owning the directory, and then setting permissions for the group to write to the directory. Find out who owns the ...
How do I copy files into /var/www with WinSCP? - Super User
Hostname is an attribute of a system stored locally on that system. "Computer name" is what Windows uses to refer to the hostname. A subdomain is a DNS concept. In DNS, domain names (domains for short) can be authoritative or non-authoritative - if they are non-authoritative, that means another server "handles" that domain. So in a domain such as www.mysite.invalid - one thing that could ...