One of the ways you can communicate with your dog is by eye contact. Make sure that when you're training your dog you have eye contact. Also when you are teaching your dog to tricks like "spin" make sure you say spin when he does it. If you do that your dog will understand what "spin" means. Also when your dog does something right say "yes" and when he does something wrong say "no". This way your dog will learn what those two words mean. Another way to communicate with your dog, the coolest way is to teach it how to speak back to you. How you do that is teach it when you speak back to bark in response. When it does give it a treat and once your dog has the hang of it it will start to do it by itself. Most of the time when it responses it most likely knows what you are saying.