Unit 21 discusses different types of editing techniques in cinema. There are two main types: continuity editing, which stitches shots together logically and seamlessly to direct viewer attention along a linear storyline, and non-continuity editing, which intentionally disrupts time/space continuity to draw attention to the editing process. Examples are given of how different techniques like cross-cutting build suspense. Specific movie scenes like from The Hangover, X-Men: First Class, Interstellar, and Inglorious Basterds are analyzed in detail to illustrate perfect continuity editing, training montages, cross-cutting, and a bomb-planting montage respectively.