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What is this git add all about?

Why do we have to git add pie over and over?

Isn't Git already tracking pie?

Answer: git add does not (only) tell Git to start tracking a file

In between the repository and your working directory is the index

When you check out a commit, the tree is copied to the index

When you run a diff, Git diffs the working directory against the index

When you record a commit, Git makes a new tree from the index

The git add command is adding files to the index
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