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The key concept in understand Git is the idea of history. Git records snapshots of the collection of files in your project. Our goal when using Git is to capture snapshots of our work. Rather than just having copies of the files in use, we can review the progression of work, reassemble it, rearrange it and repeat it as desired
It will be easier to grasp the use of Git if you keep in mind this concept of history, as most of the tasks you do in Git are related to moving through the history of your work.