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The official documentation for `git add` refers to "the index". I'm not seeing any reference to multiple indexes. I've been using git for years, and I've never heard of it. I read a book about it. But parts of it are definitely still mysterious to me. Anyway, where can I find any evidence of these 4 indexes?

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Sorry, category error. I was using index to refer to the category of which index is a member. Maybe areas is better. These are the 4 ... things...:

working directory - this is the project directory in the OS file structure

index - a.k.a the staging area

repository - in the .git directory

stash - a kind of scratch pad or clipboard for the developer

Understanding these different areas and how and why to move data into each is essential to understanding git

While you are correct, this is not what I was referring to.

To be exactly clear, there are actually 4 staging areas within what you referenced as the index. This is indeed a detail most people do not worry about.

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