What you need to know
A domain may point to the right host while www and apex versions behave differently. Mixed canonical URLs or missing HTTPS can split analytics and confuse visitors.
How to apply it
Follow the host's DNS records, verify both domain variants, choose one canonical hostname, redirect the alternate, and check certificate issuance before updating metadata and sitemap URLs.
Common mistake to avoid
Do not remove the old domain until redirects and certificate coverage are confirmed. External links may continue to use it.