GITHUB_help

http://lifehacker.com/5983680/how-the-heck-do-i-use-github
https://bitbucket.org/nye17/javelin
http://readwrite.com/2013/10/02/github-for-beginners-part-2#awesm=~ozaSlKhCgxVa7b
http://blog.teamtreehouse.com/using-github-pages-to-host-your-website
http://lifehacker.com/5983680/how-the-heck-do-i-use-github

Beautiful and simple guide :
http://rogerdudler.github.io/git-guide/


* when I wanted to initiate a new repo
mkdir quasars_sdss
git init
touch README
git add README
git status
git commit -m 'new commit'
git remote add origin https://github.com/suberlak/quasars-sdss.git
git push origin master

* when I wanted to  make some changes to a file and simply update it on github
git add file
git commit -m 'some changes'
git push

* when  I wanted to copy that repo to another computer from github
I used the MacOSX desktop version of github to clone a repo
git clone https://github.com/suberlak/quasars-sdss.git
git pull 

* when I wanted to change the directory structure 
mkdir newdir
mv *.png newdir
git pull
git add -A  # this adds both info about the deleted files, and about the fact 
            # that the same files were moved to a different dir 
git push