Time outs have worked for us. Especially if things have escalated to meltdown stage. I tell him that the X behavior is unacceptable and he sits in timeout for 5 minutes or until he's calm. Then I ask him if he knows why he's in timeout. If yes, then he apologizes for it. If not, I remind him of what he did and that it is not allowed, then he apologizes. Not just Sorry, but Sorry for doing X. We use our dining room for timeouts because it's the most boring room in the house. . No toys or TV or other distractions.

We also will take away privileges if it's appropriate for the situation.

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Oh and I try to talk about what behavior would be a better choice if it happens again. Instead of doing X, Y would be better choice.

I'm also big on preventing unacceptable behavior. If we are going some place, grocery store, restaurant, I talk to my boys about what behavior IS acceptable. Not just the things they shouldn't do, but the way they should act. Walking feet, softer inside voices, please and thank you, no climbing on things, hands to yourself, etc. things go smoother when they know what is expected of them.