Assume you have pushed commits in order A1 => B2 => C3 in remote repository.
Now you want to delete commits C3 and B2.
The simple solution is as follows using
git reset --hard <A1-commit-id>
git push -f origin <branch-name>
However, you should avoid doing this if anyone else is working with your remote repository and has pulled your changes C3 and B2.
git revert comes in
git revert --no-commit C3
git revert --no-commit B2
git commit -m "commit message for your reverts"
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