"This week is going to be really telling for the overall market," says Rachel Dashiell of Charles Schwab. She turns to technical trends in the S&P 500 (SPX) as the index faces key tests with Nvidia (NVDA) earnings Wednesday and the start of the Fed's Jackson Hole symposium on Thursday. However, Rachel believes the S&P's recent pullback is a healthy one. he highlights key support and resistance levels to watch in Motorola Solutions (MSI) and Athur J. Gallagher & Co. (AJG).