Re-reading is the most popular way to study and one of the least effective, and the two facts are related. It is popular because it is comfortable: the words are familiar, the pages turn easily, and the warm feeling of recognition is almost indistinguishable from the feeling of knowing. Almost. That gap is where the trouble lives.
Recognising a sentence is not the same as being able to produce the idea when you need it. Re-reading trains the first and leaves the second untouched, which is why you can finish a chapter for the second time, nod along the whole way, and still come up empty when someone asks you to explain it.
Make the page, do not just read it
The cheap fix is not to read more. It is to write less, by hand, from memory. A single page — the frameworks, the moves, the few things actually worth keeping — built by you, in your words, after you have read. The effort of pulling it out of your own head is the part that does the work. It is mildly uncomfortable, which is the tell that it is working; comfort is the feeling of learning nothing.
If it felt easy, you were recognising. If it felt like effort, you were remembering.
Spaced repetition without the app
Once the page exists, it becomes the cheapest review there is. A glance a week later, a glance before you need it — each pass is a small act of retrieval, spaced out over time, which is the mechanism behind every serious memory system. You do not need software to get most of the benefit. You need one page you made yourself and the willingness to look at it twice.
That is why every gist comes with a cheat sheet, and why we think it is half the value. The audio gets the idea into your head. The page is what keeps it there — and it does in thirty seconds what a full re-read only pretends to do in an hour.