The document discusses the progression from the author's preliminary task to their full thriller opening sequence. They felt they learned to use sound, lighting, editing, and camerawork more effectively to create tension, portray emotions, and conform to genre conventions. Specifically, they introduced background noise and emphasized diegetic sounds to create an eerie atmosphere. They used chiaroscuro lighting to generate suspense. Their editing in the thriller created tension through fast cuts and overlays, whereas the preliminary task focused on smooth continuity. Camera angles in the thriller projected deeper meanings about characters rather than just showing dialogue. Overall, the thriller opening provided more detail and meaning to the audience through its improved use of these film techniques.