how to undo a commit in github code example

Example 1: undo last commit

$ git reset --soft HEAD~1

Example 2: github restore previous commit

# syntax
git revert <commit>
# example
git revert 99a5c5905e12c74725bae64c61efce140662ce24
# where 99a5c59... is the commit (you can check it on github)

Example 3: git undo last commit

$ git reset --soft HEAD~1

Example 4: undo reset commit git

git reflog //to get commitID
git reset #commitID