"Trained" versus "taught" sounds like a semantics question.
We start teaching our puppies "tricks" as soon as we get them home. Some of the tricks are silly, many are foreshadows of skills we will want them to have later. (For example, they learn to turn left or turn right from both verbal commands and hand signals. That will be useful when they start agility.)
We teach our dogs to track as soon as we get them home. Here is Breeze at 10 weeks.

Our puppies learn to "find mine", where they have a choice of similar objects (we start with socks) and they are suppose to bring me the one with my scent (or Sarah's if she is the one handling the training session.)
I will second kalynzoo's recommendation of
101 Dog Tricks. The engagement, challenging, and bonding with the puppies and older dogs is what it's about. For most, the tricks will be secondary. For some, they will be useful in more advanced work.
As an aside, I suspect that Jerrybo66 would not use "bared her teeth to me" to describe a smiling dog. (I assume he knows the difference.)
Tom