know the ropes

1. To be familiar with the details of an operation: “You won't have to train the new computer operator; she already knows the ropes.”

Idioms and Phrases

Be informed about the details of a situation or task. For example, Don't worry about Sara's taking over that reporter's job—she already knows the ropes . This expression alludes to sailors learning the rigging so as to handle a sailing vessel's ropes. It was being used figuratively by the late 1800s. The same allusion is present in show someone the ropes , meaning “to familiarize someone with the details,” as in Tom's very experienced—he'll show you the ropes .