There are a plethora of synonyms for the phrase "know about," which means to have information or knowledge about something. Some synonyms include familiarize, understand, be aware of, comprehend, have knowledge of, comprehend, and be informed about. All of these words indicate a level of awareness, consciousness, and understanding of something. For instance, if you "familiarize" yourself with a topic, it means you learn and understand it enough to be able to discuss it or apply it. On the other hand, "comprehend" means to fully grasp or understand something, while "be informed about" suggests understanding the basics and having up-to-date information on a topic.