[noisy_boy]

I am doing something similar with online courses but digitally (so maybe it is not as effective as what you described). As each section of the video finishes, I write a summary in an Obsidian notebook. So everytime I resume the course, I use those notes as recap before I continue (also an opportunity to add additional thoughts or insights to the notes). Do it often times and you basically have ingested the summary of the course. If you have forgotten the details after an year, you just need to re-read the notes.

The biggest advantage I see in this approach is that it works with multiple mediums and provides sufficient space, flexibility of formatting and ability to search.

Of course, feeling of a real book in hand is something else.