give (one) the low-down
To share the truth, facts, or most pertinent information about something with one. OK, let me give you the low-down: I've got a great business opportunity lined up, but I need to borrow a few thousand dollars to get it going. This is Jane—she'll give you the low-down on day-to-day tasks around the office.
give somebody/get the ˈlow-down (on somebody/something)
(informal) give somebody/get the important and true facts about somebody/something: Can you give me the low-down on this deal with the Bank of China?