Answers for "boosttra cdn"

roll back last commit in git

git reset --soft HEAD~1

undo last commit

#this  will preserve changes done to your files
git reset --soft HEAD~1

#this will get rid of the commit and the changes done to the files
$ git reset --hard HEAD~1

revert last commit

git reset HEAD~

bootstrap cdn

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">