"To understand the topic" means to have knowledge or comprehension about a particular subject or idea. It means knowing the main points, facts, or concepts related to the topic and being able to explain or discuss it. Full definition
While there is still a lot we don't know, it's a fairly well understand topic overall. (completehumanperformance.com)
If you don't understand the topic, see if you can learn together. (home-ed.info)
Essay writing assignments not only help students in understanding the topics of subjects but also enhance writing and critical skills of the students. (studentsassignmenthelp.com)