This is CNBC's Morning Squawk newsletter. Subscribe here to receive future editions in your inbox. Here are five key things investors need to know to start the trading day: After last week's losses and with Nvidia's can't-miss earnings report on the horizon, investors are wondering what's next for the artificial intelligence trade. Can the sector that has captivated Wall Street and Silicon Valley in recent years once again lead the market, or are investors in for more choppiness? Here's what to