Notes are in italics
High level overview. Keep it brief.
Dogs are mammals. They live in houses (usually.) Aren't dogs cool? Good thing you read this overview about dogs.
A section about a specific set of tasks
Look, a section about training your dog! Why are you doing this? Why do you care? What other high-level components are affected by these actions?
A task involving a number of steps. Include images where appropriate.
Summary and deliverables
Try throwing a ball again. Did the dog bring the ball back? See, arent dogs great?
Man, your dog is smart. don't listen to people on the internet who tell you cats are better.