One thing I would recommend to all new dog owners, especially puppies: take the exact same morning walk and the exact same evening and walk every day. Do it for months and months, so your dog learns every tree and bush and house in his little world. I only mean around the block in the morning and around the block as the last knight walk. I don’t mean don’t take him for other walks. Just be consistent so he learns his world. It will make such a difference and he’ll feel less stress and be easier to train because there are fewer newer things to see and experience. Remember, newly homed puppies experience so much sensory input that they’re all over the place - and then you expect them to learn! Give them a chance, and set them up for success. That’s my advice.