[git] How can I move HEAD back to a previous location? (Detached head) & Undo commits

When you run the command git checkout commit_id then HEAD detached from 13ca5593d(say commit-id) and branch will be on longer available.

Move back to previous location run the command step wise -

  1. git pull origin branch_name (say master)
  2. git checkout branch_name
  3. git pull origin branch_name

You will be back to the previous location with an updated commit from the remote repository.

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