Tantrums, hitting, wailing on the floor 3yo, is it normal?

Yes, it’s very normal, especially if they do not get their way or something they want. If you sense one is coming, quickly find a distraction. Praise them for calming down. Parents also should remain clam, and above the situation. Butttt sometimes ignorance is bliss, let them shake off all their energy

I think all of us have been in this position. Breathe and ensure that you are first calm before disciplining your child.