Markdown is a tool for web writers and allows you to write using an easy to read, easy to write plain text format, then convert it to structurally valid HTML.
Github is a collaboration platform for software developers to land a job through published projects. Basic writing and formatting syntax
This contains some features that we can use in structures of our page and it is called "markdowm" which is as follows:
Styling text (Links to an external site.)
Quoting text (Links to an external site.)
Links (Links to an external site.)
and etc....
Note: you can follows these links above to know more.
Thank you for your interest