There are various synonyms for the phrase "knows about" that one can use to expand their vocabulary and better express themselves. Some of these synonyms include "aware of," "familiar with," "acquainted with," "versed in," "knowledgeable of," "informed about," and "well-versed in." All of these expressions convey a similar meaning to the phrase "knows about," but each adds a unique nuance to the context in which they are used. Therefore, it is essential to choose the most appropriate synonym that effectively conveys the intended message and suits the style of writing or speaking.