training a puppy

How many things do you try and teach your puppy at once? Do you do a few things or just one at a time? At the minute I'm trying to teach him 3 or 4 things at once, I'm concerned that I'm trying to cram to much into his tiny head at the minute

Every single thing you do with a pup is training. I don't think it's the amount of things you're teaching, it's how long you're doing it. Little and often is the key.
Pete

Yes little and often, keep introducing a new command and practicing them all

Yes little and often as they do lose concentration, best when they are hungry too as they work best for tasty treats