If your puppy is biting you on the hand, you should put a stop to it at an early stage so it knows not to overstep certain boundaries.
The best way to do this is to implement bite inhibition techniques which are also used by parent dogs during the forming phase between the first 3 and 18 weeks of a puppy’s life. When you play with your puppy, it will increasingly try to bite in a playful manner. As soon as it does this, whether its your hand or an object, you should stop the game with a short ‘ouch’ and then ignore the puppy straight after. The puppy then learns that fun comes to an end quickly if it bites. After a few repetitions the puppy will become more cautious and eventually completely stop using its teeth. It is important, however, always to be consistent - just as is the case with raising children
Do not allow your puppy to bite to much