How is expansionary monetary policy, or more specifically a open market purchase, supposed to work?

I need an explanation for this Economics question to help me study.

Since the end of the Great Recession of 2008, interest rates have been at historic lows—in some cases, close to zero. How is expansionary monetary policy, or more specifically a open market purchase, supposed to work? How do near-zero interest rates limit the ability of expansionary monetary policy to work?
In your opinion, how effective has the Fed’s policy been as a response to the Great Recession of 2008 and more recently the Covid 19 Recession? Please share evidence/article to support your position.
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