Acting without words. Loaded with behavior . Actor has to train his or her ear, behavior that the characters are feeling. A lot of human behavior doesn't make sense. Audience is interested in behavior , not words or information.
Audience wants worthy opponents.
Movies are all about behavior , play it through, not just dialogue. Don't go to the next line , there are no next line. Memorize lines, then forget them. Explore the moments in beginning, middle and end. Correct your impulse when you are wrong.