To know nothing, or almost nothing, about.
precious little
Almost nothing; hardly anything.
know inside and out
To know (something or someone) very thoroughly.
know the score
To be aware of a situation, especially of the consequences of miscondu …
know someone from Adam
To know or recognize someone at all.
know every trick in the book
To know all there is to be known about a certain discipline.
know which side one's bread is buttered on
To be aware of where one's interests lie in a situation.