These are good reads; I was going to post these links later today, after I had time to write up a summary, but you have saved me the trouble.

Notice that concepts make more sense when you revisit a topic, and note which topics provide keys to many others.

I realized when reading this that I have largely been following this method for computer science. Even without any obvious gears clicking into place, I understand talk about, e.g., binary trees or closures that would have baffled me a year ago.