For an actual implementation of the "students need maps" idea, check out expii: https://www.expii.com https://www.expii.com Click on "Topic map" in the header

For an actual implementation of the "students need maps" idea, check out expii: https://www.expii.com https://www.expii.com Click on "Topic map" in the header — it is a real domain-expert-created topic map of many areas of math and science. It's a free, interactive, crowd-sourced learning platform that does exactly this, especially for math — the founder is lead Coach of the USA International Mathematical Olympiad team, and a math professor at CMU. f/d: I interned there last summer.