When setting up your website, you might want to choose whether visitors are directed to the www subdomain or the root domain. You can manage this redirection through your DNS provider.

However, this option might be available to you when you're adding your custom domain, so you can choose it then. Alternatively, you can also handle it through third-party services. 

To help you with this, here are links to guides for setting up these redirects using popular DNS providers:

• Cloudflare: View instructions here or here
  
• GoDaddy: View instructions here

You can search online for more detailed instructions or help with other DNS providers or ask ChatGPT for additional assistance.