http://lifehacker.com/master-github-shortcuts-and-commands-with-this-cheat-sh-1572300741
https://www.codeschool.com/learn/git
https://www.codecademy.com/learn/learn-git
https://www.codecademy.com/learn/learn-the-command-line
Udacity How to use Git and Github
Treehouse lynda.com
Learning Linux command line
Learning Git and github
Git essential training
Git Intermediate Training
Github for web designers
15 years of git opensource.com
https://opensource.com/article/20/4/get-started-git
https://www.diigo.com/list/cat509/GIT/3cyg6ufps
freecodecamp
https://www.learnenough.com/git-tutorial
https://www.udacity.com/course/how-to-use-git-and-github--ud775
https://www.udacity.com/course/optimize-your-github--ud247
https://docs.gitlab.com/ee/gitlab-basics/