Puppies are capable of learning simple commands from a very young age but don’t try to give your puppy a meaningful training session if he is tired, highly excited or busy exploring. You need his full attention, otherwise you’re wasting your time. You can build up to training sessions in more distracting environments once your puppy is reliably responding to your commands at home.
It's normal and even cute when your puppy nibbles and even lunges at your hand. Since your puppy has been exposed to only other puppies in the litter who naturally play with mouthing and biting, it would make perfect sense why he would assume that playing with you wouldn't be different. But as they grow and their bodies become stronger, what was once cute nibbling eventually turns into uncomfortable or even dangerous rough playing bites. Dog Training
Clicker training, a common form of positive reinforcement, is a simple and effective dog training method. Although it is still fine to train your dog without clicker training, many people find it helpful. With clicker training, you can easily and effectively teach your dog all kinds of basic and advanced commands and tricks. It's fast and easy to learn how to clicker train your dog How Does The Dog Whisperer Potty Train Puppies ?