AlphaZero invented new moves in the game of Go, but it can't 'teach' them to us, it can only show us the moves and let us figure it out for ourselves (which we're doing). But note that despite this transfer of knowledge, humans didn't rise up to the level of AlphaZero, and they may never be able to. As a sibling comment points out, some things are computationally bound--and humans have a limit to computational ability (can't give ourselves more neurons/connections), whereas AI does not.