"No one would've guessed" markets would be where they are now, says Robert Schein when looking back to April's lows. He points to an expected interest rate cut from the Fed and tax cuts from Congress as bullish signals to watch for. Turning to his stock picks, he says Nvidia (NVDA) continues to "fire on all cylinders" as earnings and revenue grow. Robert also notes Amazon's (AMZN) sticky, gargantuan Prime user base and accelerating ad revenue as positives. He later explains why he's watching the Invesco Aerospace & Defense ETF (PPA).