Giving pups a five-minute walk a day along a busy road can help them to learn road sense, and get them used to sitting calmly by the road while traffic roars by, until you say it's safe to cross. Always check the collar is secure, and use a short lead in traffic. It's too easy to forget to lock a flexilead, which may mean your dog has more freedom to run into traffic than you realise. Puppies, of course, have to get used to wearing a collar and having it taken off and on, and being on a lead. You may live in the country and see no need to use a collar and lead, but this will restrict you when the dog is adult and may have to visit a town.
Pups tend to dance around and bite the lead at first, but soon get used to it.
Pups should also get used to you checking them out, looking at their paws, ears, and teeth. You can get friends to examine them, so that the pups are used to being examined by other people when they have to see a vet. You may find that adult dogs you take on are nervous of being examined, and it takes longer to get them used to it. Take it slowly and gently, and use positive reinforcement. Most dogs like back scratches, so you can try mixing examinations with back scratching.