SEO
Google to SEOs: Stop Treating 404s Like Emergencies
Google says 404s aren't an SEO problem. The real call is business and UX: redirect to a true replacement or build a helpful custom 404.
redirects.
SEO
Site migrations can drag past 4 months: Google’s fix
A finished domain migration can flip back 4 months later. John Mueller explains the www/non-www gap and the signals that keep the old domain canonical.
