The video discusses door opening angles for cabinet doors, which are determined by the hinges used. Hinge angles can range from 90° to 170°, with 170° hinges commonly used for corner cabinets. 110° to 120° hinges are popular for general use, as they allow easier access to cabinet contents. However, hinge angle restriction clips can be used to prevent doors from opening beyond a specific angle, which is helpful when a door might collide with other objects.