This is how to go back to a previous commit!

Step by step

1. Go to github, check commit id.
2. Checkout in the local git (" git checkout id-commit . "). DON'T FORGET DOT IN FINAL
3. Commit your update (" git add . ") and then ( git commit -m "back to a previous commit" ).
4. Push to github server (git push).

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• How To Go Back To A Previous Commit