Alphabet is an example of how an elephant can still dance.Alphabet (GOOGL 1.08%) (GOOG 0.96%) has already entered the trillion-dollar club, but its investment story is far from finished.While the company is now too large to deliver the kind of explosive, early-stage returns investors might find in small-cap compounders, Alphabet still has several meaningful engines of growth that could drive solid compounding for years.For long-term investors, three areas matter far more than everything else: AI monetizatio ...