Teach them "Sit," "Stay," "Come," and "Off." "Sit" means you can get them to settle when you need them to. "Stay" means they know not to move again until you say—that's an important one that could save your dog if they're about to run in the street or do something they shouldn't. "Come" means to come to you or to anyone who's caling, which would be helpful if they ever got lost. And "Off" means to leave something and not to ever touch it again, which could save them from getting into something dangerous.