This document discusses the use of the prepositions "at", "in", and "on" to indicate place or location. It provides examples for when to use each preposition, such as using "at" for specific points, public places, addresses with house numbers, and locations on surfaces. "In" is used for areas, buildings, containers, and addresses with only street names. "On" indicates surfaces, points along lines like roads, and coastal locations. The document aims to clarify the distinctions between these similar prepositions of place.