How do I 'overwrite', rather than 'merge', a branch on another branch in Git?

Question

I have two branches, email and staging. staging is the latest one and I no longer need the old changes in email branch, y

Answer 1

I've seen several answers and that's the only procedure that let me fix that without any conflicts.

If you want all changes from branch_new in branch_old, then:

git checkout branch_new
git merge -s ours branch_old
git checkout branch_old
git merge branch_new

once applied those four commands you can push the branch_old without any problem