If you checkout a commit sha directly, it puts you into a “detached head” state, which basically just means that the current sha that your working copy has checked out, doesn’t have a branch pointing at it.
If you haven’t made any commits yet, you can leave detached head state by simply checking out whichever branch you were on before checking out the commit sha:
git checkout <branch>
If you did make commits while you were in the detached head state, you can save your work by simply attaching a branch before or while you leave detached head state:
# Checkout a new branch at current detached head state: git checkout -b newBranch
You can read more about detached head state at the official Linux Kernel Git docs for checkout.
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