how to revert last commit on github code example

Example 1: roll back last commit in git

git reset --soft HEAD~1

Example 2: revert last commit git

$ git commit -m "Something terribly misguided" # (0: Your Accident)
$ git reset HEAD~                              # (1)
[ edit files as necessary ]                    # (2)
$ git add .                                    # (3)
$ git commit -c ORIG_HEAD                      # (4)