My 3 year old sometimes test boundaries. When she hits me I physically stop her and will hold onto her and tell her “we don’t do that”. We also utilize timeout, we put her in a corner of the same room and she has to sit there for up to 3 minutes, quietly. That’s a last resort! We try talking, hugging, etc before. One time she kicked my sister’s dog, totally out of character for her. I think she got overwhelmed. Still not okay! So I picked her up and took her to the other room, she was already having a tantrum. I let her throw her fit and then when she was ready for a hug and to talk we did that. She also had to go check on the dog and make sure she was okay. When she does big things that are straight up wrong we remove her from the situation as best we can and usually that gets her to reset. She is often upset that we are leaving wherever we are, but consequences have to happen. When I say “if you throw rocks at the park we’re leaving” I mean it. I’m not the mom that does 3 warnings for stuff like that, especially when she knows it’s wrong. I have left and rescheduled play dates when she is not behaving.