Git Command- A simple Way

Intro
As a beginner of using Git, I want to keep it simple and don't want to study deeply into it.
2 days of study and research on Git is enough for me.
Most Useful Command
I find that, below command is the most useful and can help me to do the version control perfectly in most of the time.

Git: stash and checkout

 
As we know, if you want to checkout, you must need to clean your working DIR.
That's it, create a commit or stash you change.
Stash, means save your files on a temporary place in a stack data structure.
Below is a example on this.