Answers for "how to revert a merge in git"

cancel a merge git

git merge --abort

git undo merge

git reset --hard HEAD~1

git undo merge

$ git reset --hard HEAD~1

how to revert a merge locally

git reset --hard <cbm>

where cbm is the commit number before the merge you want to revert
to get a list of all the merges you can use the following line

git log --graph

and then use the commit number from the one before the merge you want to revert

Undo git merge

git reset --merge HEAD~1

git revert merge

git revert -m 1 <merge-commit>