My domain fncll.org is the “main domain” for one of my shared hosting accounts. I want to migrate, for now, just my main web site at https://fncll.org/ to a cloud environment. I actually want to rebuild the site, so this isn’t about content, but about the magic DNS incantations needed on both ends to move just the main site while keeping all the other subdomains, etc (commonplaces.fncll.org etc) functioning just as they are now, using the shared hosting.
I followed the guide(s) and things seem to be working with the A record and the SSL. However, this guide also says I should set up a CNAME entry, which the system won’t let me do. Is the CNAME necessary?