Had some issues understanding the difference between Keynesian and the neoclassical approaches

1 Summarize the difference between the Keynesian and the Neoclassical approaches to macroeconomics. Be sure to mention (at the very least) the Phillips curve, the short run AS curve and the response to recession. (At least one paragraph.) 2. Explain why some analysts believe that the money multiplier is smaller now due to the Fed paying interest on reserves. 3. Who is President-Elect Biden's pick for Treasury Secretary? What prominent position has this person previously held? 4. What type of open market operation is expansionary? (Is it a purchase or sale of bonds?) 6. What is the difference between the national debt and the deficit