There are three main documentary genres described in the document:
1) Reflexive documentaries acknowledge the filmmaker's presence and role in constructing the narrative. They are often experimental in nature.
2) Observational documentaries aim to spontaneously observe real life with minimal intervention. They typically do not include voiceovers, music, or reenactments.
3) Poetic documentaries use impressionistic, fragmented filmmaking to aesthetically reconstruct the world through patterns and associations rather than traditional narrative structures. They focus on evoking emotions rather than following life-like characters.