The Dow dropped more than 700 points, with the S&P and Nasdaq also plunging, and Jim Cramer is helping you understand the importance of the Fed’s rate hike to the major averages. First, he's explaining why investors might want to buy into the bank stocks as the central bank raises rates. Then, Cramer gives his opinion on the four most important things to consider when trying to understand the rate hike cycle. Plus, Cramer goes one-on-one with Ferguson CEO Kevin Murphy to learn more about the state of the housing market.