The document discusses what was learned from watching the openings of the films Trainspotting, Insidious, and The Woman in Black. It notes that film openings set the tone for the rest of the movie and give audiences insight into what to expect. Openings for thriller and horror movies sometimes obscure the genre initially to build suspense but include some mysterious or scary clues. An effective opening also backs up the rest of the film by setting the atmosphere and engaging audiences.