What is a Github Pages GitHub Pages is a static site hosting service that takes HTML, CSS, and JavaScript files straight from a repository on GitHub, optionally runs the files through a build process, and publishes a website. You can see examples of GitHub Pages sites in the GitHub Pages examples collection.
You can host your site on GitHub’s github.io domain or your own custom domain. For more information, see “Using a custom domain with GitHub Pages.”
To get started, see “Creating a GitHub Pages site.”
More Reference: Github Pages
What is Markdown Markdown is a lightweight and easy-to-use syntax for styling your writing. It is commonly use to maintain the content of the information you find out in Github
You can look at this great Markdown cheatsheet from Adam Pritchard that consolidate some tips and tricks on using Markdown.