The document outlines six key categories of documentaries as described by film critic Bill Nichols: poetic, expository, observational, participatory, reflexive, and performative. It provides examples and brief descriptions of each type, including key points about expository documentaries speaking directly to viewers authoritatively, participatory documentaries emphasizing the relationship between filmmaker and subject, and observational documentaries attempting to minimize interference with the subject matter. Examples of documentaries like Super Size Me, Frozen Planet, and Don't Look Back are also mentioned.