Source from: https://help.github.com/articles/fork-a-repo
Fork A Repo
If you’ve found yourself on this page, we’re assuming you’re brand new to Git and GitHub. This guide will walk you through the basics and explain a little bit about how everything works along the way.
Contributing to a project
At some point you may find yourself wanting to contribute to someone else’s project, or would like to use someone’s project as the starting point for your own. This is known as “forking.” For this tutorial, we’ll be using the Spoon-Knife project.
Step 1: Fork the “Spoon-Knife” repository
To fork this project, click the “Fork” button.
Step 2: Clone your fork
You’ve successfully forked the Spoon-Knife repository, but so far it only exists on GitHub. To be able to work on the project, you will need to clone it to your local machine.
Run the following code:
git clone https://github.com/<em>username</em>/Spoon-Knife.git# Clones your fork of the repository into the current directory in terminal
Step 3: Configure remotes
When a repository is cloned, it has a default remote called
origin that points to your fork on GitHub, not the original repository it was forked from. To keep track of the original repository, you need to add another remote named
cd Spoon-Knife# Changes the active directory in the prompt to the newly cloned "Spoon-Knife" directory git remote add upstream https://github.com/octocat/Spoon-Knife.git# Assigns the original repository to a remote called "upstream" git fetch upstream# Pulls in changes not present in your local repository, without modifying your files
More Things You Can Do
You’ve successfully forked a repository, but get a load of these other cool things you can do:
Once you’ve made some commits to a forked repository and want to push it to your forked project, you do it the same way you would with a regular repository:
git push origin master# Pushes commits to your remote repository stored on GitHub
Pull in upstream changes
If the original repository you forked your project from gets updated, you can add those updates to your fork by running the following code:
git fetch upstream# Fetches any new changes from the original repository git merge upstream/master# Merges any changes fetched into your working files
Branching allows you to build new features or test out ideas without putting your main project at risk. In git, branch is a sort of bookmark that references the last commit made in the branch. This makes branches very small and easy to work with.
If you are hoping to contribute back to the original fork, you can send the original author a pull request.
Unwatch the main repository
When you fork a particularly popular repository, you may find yourself with a lot of unwanted updates about it. To unsubscribe from updates to the main repository, click the “Unwatch” button on the main repository.
Delete your fork
At some point you may decide that you want to delete your fork. To delete a fork, just follow the same steps as you would to delete a regular repository.