301 Moved Permanently

If you have a page that’s permanently changed URLs (e.g. www.example.com/old-page has changed to www.example.com/new-page), you should implement a 301 redirect and relink all previous resources to the new URL.

A 301 HTTP status code indicates that the requested resource has been permanently assigned a new URL (Uniform Resource Identifier).

301 redirects pass 100% PageRank from the old page to the redirected page, though it was noted otherwise previously.