Loose leash walking

How to train your dog not to pull - Dog Training

Loose Leash Walking Tips with dogs who are strong pullers

Stop pulling and “Yo-yoing”- Dog Training

Loose Leash walking - No Pullling! Problem Solving
. . . access to the environment is contingent upon loose walking. . . .

New leash walking trick for pulling ahead after a treat - Dog Training
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Teach your dog not to pull - teach 'back up' for leash walking

In summ:
for puppies I guess:

• dogs like exploring
• dogs typically have pulling reinforcement: tension + dog snipping success
• also dogs have opposition reflex.
• in a low distraction environment, leash leading exercise (no verbal cues) with clicker (or a marking word)
  • be careful: leash is not a mean to control.
• add distraction (toys around + more and more distraction)