Shot reverse shot is a film technique where one character is shown looking at another character (often off-screen), and then the other character is shown looking back at the first character. The shot is heavily used by the Coen brothers as seen below

The 180 degree rule explains that by keeping the camera on one side of an imaginary axis between two characters, the first character is always frame right of the second character

A master shot is a film recording of an entire dramatized scene, from start to finish, from an angle that keeps all the players in view.