I recently did a very useful exercise where we were to write down everything that is reinforcing to your dog. These things include food/toys/environment etc. You then rank those items and that will help you to include rewards that are useful for training. It often doesn't make sense to us what dogs find rewarding but with some planning we can use that information. Control access to those rewards and use them to reinforce the behaviours that we want and that help create joy for the dog in working with us.
"Never doubt that a small, group of thoughtful, committed citizens can change the world. Indeed, it is the only thing that ever has." - Margaret Mead