When setting up your custom domain name, you may also want to be sure if a visitor types in your website URL with the www. that they are directed to your website and not a “parked” page hosted by your domain name provider.
Most domain name hosting providers will allow you to “Forward” the non www. version of your domain name to the www. version of your domain name. The “Forwarding” setting are generally found under your DNS or Domain Name settings.