This document summarizes the key rules and types of prepositions. The two main rules are the choice of preposition, which must follow certain words to clearly convey relationships, and the place of the preposition, which must be followed by a noun. Some types of prepositions are those of location, place, time and movement. Prepositions of location describe specific places, while prepositions of place depend on the context. Prepositions of time refer to durations. The article provides examples to illustrate these rules and types of prepositions.