The next job - choose a task that is very easy to train and doesn't "matter". You will make mistakes, the dog will likely be a bit confused, and you don't want to damage important behaviours while you're learning. I would recommend a nose touch to your hand because it's really easy to teach.
There are different ways to teach it, but I just sit down on the floor with the pup and put my hand out to the side of his face. If you put it out in front, it can cause the puppy to back off, whereas if you put it to the side, you will find they turn towards it. Click as soon as the pup looks towards your hand, even if he's not making contact at this stage. Then deliver the treat on the floor. Position your hand again, click when he looks again, deliver the treat on the floor again. The position of where you feed helps you to set up "loops". That is, if you were to feed with him still looking at your hand, you would have to break that look off somehow to start again. What you want is a clean loop so that the end of the chain (behaviour > click > reinforcement) is in a position where the behaviour can (and is likely to) be immediately offered again. So feed on the floor so that the next move is the nose coming up towards your hand again. Hurrah! Loopy training! Do this for ten treats, then take a break and have a play. Training should be a predictor of playtime for young pups especially.
Note: you shouldn't be trying to encourage the puppy to touch your hand, either verbally or physically. Just set up your environment so it is the most likely thing that will happen. Don't say anything (you can give verbal praise alongside the treat, just don't say anything to try to get the puppy to do the behaviour).
When you start your next session, set it up the same and have a refresher. So maybe fifteen treats, five of which are to go over the behaviour you had from the previous session, and the next ten are to build on that. You can start clicking only when there is contact with your hand - but be led by the puppy. If he is finding it hard, make it easy for him again. You should be aiming for a clickable moment every few seconds; if you're getting pauses or other random behaviours, your puppy is telling you "I can't", and you need to make it easier again.
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