word.domain.com – how to?

That’s a subdomain, and you can set that up either in your hosting control panle, or through your domain registrar. I’d try the hosting first as that is normally the easiest way of doing it.

Ok. Interesting. Is this technique beneficial for SEO?
For instance: Their domain name: https://abuse.supportgroups.com
for a search for “abuse support group”

or if they had: https://supportgroups.com/abuse-support-group
as oppose to: https://abuse.supportgroups.com

Which is better for SEO?

I am not sure. Personally, if SEO is the main concern I’d do the sub-folder, but that could be wrong.

You’d really need to ask on some forums that are more dedicated to SEO to get a better answer.

Thanks a bunch Catacaustic! ??