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Here's a simplified step-by-step guide on how to do it:

Create a GitHub Repository: First, create a GitHub repository for your website. The repository name should be in the format <username>.github.io, where <username> is your GitHub username. This will make your website accessible at https://<username>.github.io.

Add Your Website Files: Add your website's HTML, CSS, JavaScript, or any other relevant files to the repository. You can also use a static site generator like Jekyll if you prefer.

Create a CNAME File: To associate a custom domain with your GitHub Pages site, create a CNAME file in the root of your repository. The CNAME file should contain your custom domain name (e.g., example.com or www.example.com).

Set Up Domain Configuration: Next, you'll need to configure your domain registrar to point to GitHub's servers. This involves setting up DNS records. You generally need to create two records: an A record pointing to GitHub's IP addresses and a CNAME record that points to <username>.github.io.

GitHub Repository Settings: In your GitHub repository, go to the "Settings" tab. Scroll down to the "GitHub Pages" section. There, you can select the custom domain you want to use. It may take a little time for DNS changes to propagate.

Secure Your Site (Optional): You can also enable HTTPS for your custom domain by using a service like Cloudflare or GitHub's built-in HTTPS support. This is important for security and SEO.