I have many hours experience learning from books (though I don’t disagree with the authors reasons books don’t work). However quantum.country did not work for m

I have many hours experience learning from books (though I don’t disagree with the authors reasons books don’t work). However quantum.country did not work for me. I think I prefer more organic spaced repetition. Like read an article/attend a lecture/read a book/watch a YouTube video about a subject and then do it again about the same subject later. Perhaps the “scientific” spaced repetition can be more efficient if I really work hard at it, but I just don’t know.