Remove file added accidentally in last commit

• Create a bunch of files. Some we would like to track some we don’t.
• Use git add . to add all the files.
• git commit -m "add all the files" to commit.
• Realized we added files we did not want to.
• Remove the unwanted files git rm --cached FILENAME (but keep them in the workdir.
• git commit -m "add only the important files" --amend