https://github.com/

https://guides.github.com/activities/hello-world/

http://www.cnblogs.com/twtp/articles/5264073.html

GitHub is a code hosting platform for version control and collaboration.It lets you and others work together on projects from anywhere.

This tutorial teaches you GitHub essentials like repositories

You’ll create your own Hello World repository and learn GitHub’s Pull Request workflow, a popular way to create and review code.

http://www.markdown.cn/

https://stackoverflow.com/

What is GitHub?