Why rewarding what is right works better than correcting what is wrong, explained by someone who was trained that way.
How we do it in the pack
We always start with short sessions in a calm place, with rewards the dog really wants. When it goes well, we raise the difficulty little by little: more distance, more time, more distractions. When it goes badly, we take a step back with no drama.
Always finish with an exercise your dog already knows. Ending on a success is half the work for the next session.