Before describing how to fork we need to know what is forking.
Well, forking a project means, you are taking a copy of the project developed by others and you are not a contributor in that project. Surely the codes should be open source. You take a copy and start developing the codes independently in your own way and this is something more than just follow a project.
Now let’s describe the process with an example.
After login to Github.com find the repository which you like to fork.
For example Here I am forking twitter / bootstrap.
Click on the repository name and there you will find a Fork button on the upper right side of the browser.
Click on that Fork button to fork the repo.
Then it will start forking.
Wait this will take a few second to complete.
After successful forking, a copy of the project is yours.
Follow that now this is showing your username / bootstrap instead of
twitter / bootstrap .
This is also showing from where the repo is forked.
Now go to your Github for Windows application.
There you will find the newly forked repository.
Clone the repository in your local machine.
After cloning the repository it is in your local machine.
Now you can start developing the project.
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