Puppies have a lot of energy and like babies, they're too young to know what they should and shouldn't get into. You need to make your home as safe as possible for your new bundle of joy. Get down on your hands and knees and pretend you're a puppy. Maybe, but it works. Seeing your home from a puppy's eyes level will help you spot anything dangerous.
Some common houseplants are poisonous.
Unplug all small appliances when you're not using them. Inspect your home for any frayed electrical cords that can shock your puppy if he tries to play with them. Cords hanging from blinds can be deadly. Your puppy can hang himself if he gets tangled in one of these cords. Cut blind cords, wrap them tightly around a bracket, or tape them tightly to the top of your window.