Merge pull request DataScienceSpecialization#38 from stoked/patch-2

Update curated.md

Author: seankross

curated.md

@@ -12,12 +12,16 @@ permalink: /curated/
 ### Command Line
 
 - [explainshell.com - match command-line arguments to their help text](http://explainshell.com/)
+- [The Command Line Crash Course - Quick course in using the command line](http://cli.learncodethehardway.org/book/)
 
 ### GitHub
 
+- [Official Git Tutorial](http://git-scm.com/docs/gittutorial)
 - [Git - Simple Guide](http://rogerdudler.github.io/git-guide/)
+- [Git Immersion - A guided tour through the fundamentals of Git](http://gitimmersion.com/)
 - [GitHub - Dealing with Multiple Accounts](http://hmkcode.com/git-tutorial/how-to-deal-with-multiple-github-accounts-on-one-computer/)
 
+
 ## Further Reading
 
 - [Linkedin - Top 10 Big Data and Analytics References](https://www.linkedin.com/pulse/article/20140810194033-111366377-top-10-big-data-and-analytics-references)