d:\github_desk is the root folder for all repositories

git init  
#will create a repository in current folder  
git clone  https://github.com/notmikeb/xxx.git  
#will create a sub-folder , named xxx, and clone the file to it  

<cd d:\github_desk\workspace>
<add / remove some file>
sh> git commit -m "this is a update"
sh> git push
<enter notmikeb>
<enter password>
this is the SOP of checking files