GitGuide How to use GitHub. how to use git https://rogerdudler.github.io/git-guide/index.ko.html Markdown Tutorial www.markdowntutorial.com how to sync fork between original https://help.github.com/articles/syncing-a-fork/ how to clone a repo's subdirectory http://stackoverflow.com/questions/600079/how-do-i-clone-a-subdirectory-only-of-a-git-repository