[git] How do I remove a single file from the staging area (undo git add)?

For newer versions of Git there is git restore --staged <file>.

When I do a git status with Git version 2.26.2.windows.1 it is also recommended for unstaging:

Changes to be committed:
  (use "git restore --staged <file>..." to unstage)

(This post shows, that in earlier versions git reset HEAD was recommended at this point)

I can highly recommend this post explaining the differences between git revert, git restore and git reset and also additional parameters for git restore.

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git add only modified changes and ignore untracked files How do I remove a single file from the staging area (undo git add)?