Crate training is a great way to ensure that your puppy is safe and secure when you leave him alone.
Start as soon as you bring your new puppy home. Purchase a crate that will accommodate him as he grows, and use boxes to take up the excess space. Remove them as he gets bigger. Give him an interesting toy once he’s in the crate that he only gets when he’s there.
Be committed, and always put your puppy in the crate when he’s alone so that he doesn’t get mixed signals. Leave the door open once he’s trained, so that he can still go into it and use it as a retreat.