This video shows how to begin the Doggie Zen exercise, which teaches a dog to resist mugging your hand containing a treat. It's a foundation behavior for teaching a dog to "Leave it," and teaches self-control.
This video shows the high rate of reinforcement needed to begin teaching a beginner dog to walk next to you in a decent heeling position.
This video shows an early goal for the exercise of getting a dog to target your hand with his nose. Target behaviors teach self-control and are foundational for many other behaviors.