Git RM

Used to remove files from the Index, in the event they are deleted from the working tree, and need to be deleted from future commits.

Example

I’ve already deleted this file from the Working Tree, now I want to remove it from the Index.

ariadne@tesseract:~/git/network-notes$ git status
On branch main
Your branch is up to date with 'origin/main'.

Changes not staged for commit:
  (use "git add/rm <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
        modified:   .github/workflows/mdbook.yml
        modified:   book.toml
        deleted:    src/New Text Document.txt

git rm --cached src/New Text Document.txt

References

Git - git-rm Documentation