Yes agree consistency and constant telling him why you say no etc ..

Consistency! And it’s work, but until he is trained, every time he crosses the line (and any leeway you give will make it less effective) you need to discipline. By 2, pops on the hand no longer worked for us and so I would make sure he was making eye contact with me and then tell him what he did wrong(always in a calm voice) and then pop his thigh right under the diaper... then I always comforted the cries and made sure he knew I loved him and told him it was mommies job to teach him to obey and learn how to act right and that next time I knew he would (fill in the blank) do the right thing. This has worked for both my boys. Good luck! It’s not easy, but once they get it, you just reinforce when necessary and life is so much easier and peaceful. Anyway, that’s what worked for us. Good luck! Toddlers are hard!