A search engine friendly way to redirect an old page to a new one is to add the following line in your .htaccess file.

“Redirect permanent /old-page.html http://www.newsite.com/new-page.html”

If you would like the “404 Webpage Not Found” error to redirect to another page on your website – just simply create (or edit) your .htaccess file. This file should be at the root level of your site’s directory where your root webpages are stored.

Add the following line: “ErrorDocument 404 /pagename.html”