The document discusses the use of prepositions after adjectives. It explains that the prepositions "about" and "at" are used after adjectives when there is a complement. For example, saying "excited about having a baby." It also notes that the "-ing" form of a verb is used when expressing an action after a preposition, like "excited about having." Finally, it provides examples of adjectives used correctly and incorrectly with "about" and "at."