git revert -m 1 <merge-commit>
With ‘-m 1’ we tell git to revert to the first parent of the mergecommit on the master branch. -m 2 would specify to revert to the first parent on the develop branch where the merge came from initially
(lieber vorher prüfen welcher branch welcher ist)
While you are in the middle of working on something complicated, you find an unrelated but obvious and trivial bug. You would like to fix it before continuing. You can use git-stash(1) to save the current state of your work, and after fixing the bug (or, optionally after doing so on a different branch and then coming back), unstash the work-in-progress changes.