Is there a minimal set of DNS records that serves as a standard for all websites to adhere to? Was there any attempt to create such a standard by an international Internet authority?
By the way, this question is quite a follow up for this question.
I don't believe there is a standard as such. Personally I always
AAAA records to resolve sites and I avoid
CNames as it's another DNS lookup.
DNSsec as well for that bit of added protection and proper mail server records including
DMARC as strict as possible to stop your domain being flagged.