If they did something after you asked them not to, it’s because they lack impulse control. If they jump on the couch, they need to get outside and run. If they spread mashed potato all over the wall, they need sensory play. If they tantrum, they most likely need a snack, or a nap, are overstimulated. If they’re hitting, they need practice with conflict resolution which they will not get sitting in the corner. If you have no idea what they need, a hug is almost always the right answer. If they won’t leave the park, they need a race to the car or 3 more times down the slide or, heck, a trip to the ice cream shop on the way home.