Github is a website that uses git which is the version control system. So, as we said before git keeps track of the changes you've made to your files/project. Github is used to keep those files with the tracking online. So, it's basically like uploading your files online but with a twist.
Start by opening www.github.com and register. I'll wait for you to finish....
So, now that you have an account, you can even login in codeunicorn using your github account. Try it out...
Now we're done from github, but we'll get back to it later.