How do you decide what EXACT aperture to use?

How do you decide what EXACT aperture to use? I understand this is probably a very basic question, but for some reason I’ve struggled understanding this. I’ve often heard people say, if you want the whole scene in focus, use f8 or above. Why would I go above then if f8 works? And there are several stops above f8 all the way to f22 — how would I know exactly which stop would keep my entire ...

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