ins and outs of (something)
all the details of something
The supervisor knows the ins and outs of the new machine.
Rules to play Goal Ball
In order to maintain an equal advantage, all team members, must wear eyeshades at all times, during the game. After the game has started, a player may only adjust his or her eyeshades, by raising your arm up in the air, and calling eyeshades. Only then, after the referee tells the person to turn around, may the person adjust their eyeshades.