Further reading on GitHub Pages
GitHub Pages is available in public repositories with GitHub Free, and in public and private repositories with GitHub Pro, GitHub Team, GitHub Enterprise Cloud, and GitHub Enterprise Server. For more information, see "GitHub's products."
See "Customizing GitHub Pages" for more information on using approved Jekyll plugins with GitHub Pages sites, creating custom 404 pages, and viewing available repository metadata.
See "Troubleshooting GitHub Pages builds" and "Troubleshooting custom domains" for further help.
You can also take a free interactive course on how to use GitHub Pages with GitHub Learning Lab.