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JavaScript is a programing languages
With Git Hub you can creat your own verison of your code in the same time with others. Once you done with your version you can request to overview your code and merge the changes into the main project.
You can revisit your changes - with every commit you creat a snapshot of your work.
You can access the repository from anywhere as it’s cloud based.
With a fork you creat a copy of the repository but under your name - whit the forked repot you can start working on your own ideas and you can share this later once it’s completed.
When you clone the repository - you dowload the files the completed history to your own computer.
A pull request is a safety check of the code to ensure there is no bugs that will merge into the main project - this way you can leave comment to each other and make the necessary changes if needed.