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Beginner question: how do I annualize alpha?

Hi,

I'm trying to calculate the beta and alpha (with $SPY as my benchmark) for my personal portfolio.
I haven't had the time yet to delve into a lot of quant stuff (it's something I want to do as soon as possible), so I'm not sure if I'm way off base or if the concept is correct.

I've attached the cell in the notebook where I try to compute them.