As a wiki tracking topics Ive studied, with review questions in folddown. I create inpromptu stubs of cladograms with dendron's hierarchy as I go though materials that alert me to gaps in my knowledge, spaces that I would fill in later as I cover more in the subject. I make review sheets by referencing notes. And as I learn more about a topic or encounter more information in practice exams, I add in the information I learn into each topic hierarchy