I created an account at https://github.com/, fork someone's project so I have my own repository, instal github client for windows, and clone my repository to my local drive.
I will work on my local drive. But during the developement of the project, I would like to merge the changes in the official, original, project.
I didn't find how to do this. Before, I use tortoiseSVN client for windows, and there is an option "SVN Update" which can update the project to the latest revision. But I am new to Github and its client, and don't know how to do it.