It depends.
If you would like to provide human food (please double check with your veterinarian) to your dog, this can be a great rare treat. More importantly however, providing human food or any kind of high value treat can and should be used in scenarios where your dog has a more difficult time making good decisions.
For example, when you're walking past a dog park if your dog feels very excited and distracted you can use a high value treat as a reward when they're able to give you more of their attention.