Thanks for the reply. That makes sense. I now understand how to point the domains / subdomains using “A” record.

Could you please also clarify which IP I need to open ports 80 and 443 to, in the router? Or does the IP in the router actually refer to the internal IP device addresses? (Like 142.168.0.6, etc)?

And to which IP do I open ports 80 and 443 in my router, then?

(You are really underestimating the second S of KISS in my case, sorry!)