There are 6 main types of documentaries: fully narrated, fly on the wall, mixed, self reflective, docu-drama, and docu-soap. Fully narrated documentaries use voiceovers to provide context, fly on the wall is purely observational with no interviews or narration, mixed documentaries incorporate interviews, observations, narration and archive footage, self reflective acknowledges the filmmaker's presence, docu-dramas recreate events dramatically, and docu-soaps show real life in a particular field over time. The document also discusses key elements of documentaries like observation, interviews, dramatization, mis-en-scene, and exposition. It notes the contributions of John Grierson