know the whys and wherefores (of something)

To be aware of or knowledgeable about the various underlying factors that cause or contribute (to something). I don't need to know the whys and wherefores—just tell me how long the project will be delayed. Our tour guide really knew the whys and wherefores of the city's troubled past.

See also: and, know, wherefore, why

See also:

wherefore
whys and wherefores
the whys and wherefores
whys and wherefores, the
whys and wherefores of
be well aware of (something)
be well aware of something
why
know what (one) is talking about
know what you're talking about

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