To connect a Squarespace domain to a website hosted on GitHub Pages, follow these steps:1. Determine your GitHub Pages URL and make sure it is published and publicly viewable.2. Add a CNAME file with your custom domain to your GitHub repository to inform GitHub Pages.3. Obtain GitHub Pages IP addresses and update DNS settings in Squarespace with the A records and CNAME.4. Wait for DNS propagation and verify the setup to ensure your GitHub Pages site is served through your custom domain.