DAG
here".git
GPG
writtenQuick
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refs: References, or heads or branches, are like post-it notes of bookmarks, "I'm working here".git commit adds a node to the DAG and moves the post-it note for current branch to this new node.The HEAD ref is special in that it actually points to another be recovered from just the DAG with git fsck --lost-found.The nodes in the DAG can be moved from repository to repository, can with one commit in it. commit node was created in the DAG. commits. rebase your branch, where instead of merging, your commit is replaced by another commit with a different parent, and your branch is moved there.Your old commit(s) will remain in the DAG until garbage collected.
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