There are countless synonyms for the phrase "have knowledge of," each with its own unique connotation and tone. Some possible alternatives might include "possess expertise in," "be well-versed in," "be familiar with," "have a mastery of," "understand," "comprehend," "know," "be aware of," "have insight into," "grasp," and "be proficient in." Depending on the context and the desired level of precision or emphasis, different synonyms may be more appropriate. Ultimately, the most important factor is to choose a synonym that accurately captures the intended meaning and conveys the desired tone.