Learning the meaning of the words Good and No should be one of the basic things that you need to teach to your dog.
This is because, you would be using these words on a daily basis whenever you interact with him.
Your dog should know that whenever you say Good, it means that he has done something right.
On the other hand, whenever you say No, he should know that he has done something wrong.
Nagging your dog should not be practiced
Nagging your dog is not something that should be done, since it would not bring any kind of positive results.
If you do it to your dog, it can only mean two things to him, it would mean nothing since he does not understand what you are saying or it can mean something negative, due to the tone of your voice.
In any case, it should not be done, since it would not be beneficial for both of you.