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+The Differences:
+
+Forking is a copy of codes and programs that allows you can change them and do not affecting anything which is before you fork. And you can copy a repository to your GitHub repo from others GitHub repo. But these are only on the GitHub.
+
+Clone is a copy of repository to your local pc so that you can edit them in local. Unlike forking, Clone is moviing codes or files from GitHub to your computer.
+
+And Git Branches are effectively a pointer to a snapshot of your changes. 
+All branches on GitHub will be copied in a fork. 
+
+Yucheng Ma.