Where exactly does the education of the puppy begin?

At least since the beginning of the Corona pandemic, so many dogs were bought as puppies, young dogs or dogs with a past. Sometimes more than the market could offer. But what happens to the dog when the initial euphoria has faded and problems arise? Many new dog owners who, in a frenzy of emotion, pick up the new family member at the kennel, at the motorway service station or abroad at the market during their holiday, think least of the education of the social partner on four paws. But where exactly does the education of the puppy begin? For most dog owners, not until the dog's pubertal phase, when the behaviour is perceived as disturbing or even dangerous.