This document provides guidance on creating effective film opening sequences in 3 sentences or less. It discusses conventions like length, standalone vs integrated openings, and establishing genre, theme, characters and atmosphere over complex narratives. Common mistakes like too much narrative, lack of negative space, huge fonts, too many locations, and lack of preparation are identified. The document advises to be consistent with micro/macro conventions, build atmosphere, establish genre, give character and have enough time and equipment to plan, shoot and edit well.