Why are there two ways to unstage a file in Git?

Question

Sometimes git suggests git rm --cached to unstage a file, sometimes git reset HEAD file. When should I use which?

EDIT:

D:\         


        

Answer 1

It would seem to me that git rm --cached removes the file from the index without removing it from the directory where a plain git rm would do both, just as an OS rm would remove the file from the directory without removing its versioning.