>All hostnames (domain names) qualify for fully-managed certificates if they: -are non-empty -consist only of alphanumerics, hyphens, dots, and wildcard (*)

>All hostnames (domain names) qualify for fully-managed certificates if they: -are non-empty -consist only of alphanumerics, hyphens, dots, and wildcard (*) -do not start or end with a dot (RFC 1034) Someone help me understand this part...didn't know this