docs/data/reusables/pages/www-and-apex-domain-recommendation.md

If you are using an apex domain as your custom domain, we recommend also setting up a www subdomain. If you configure the correct records for each domain type through your DNS provider, {% data variables.product.prodname_pages %} will automatically create redirects between the domains. For example, if you configure www.example.com as the custom domain for your site, and you have {% data variables.product.prodname_pages %} DNS records set up for the apex and www domains, then example.com will redirect to www.example.com. Note that automatic redirects only apply to the www subdomain. Automatic redirects do not apply to any other subdomains, such as blog.