One time I tried to understand the QR algorithm and I didn't understand it at all despite trying multiple times.
Maybe I can try again with the help of LLMs. Hmm not a bad idea
There is also a nice Veritasium video about it, if you prefer that: https://youtu.be/w5ebcowAJD8
I found this page very helpful in understanding each step of the QR code creation process. I can't say I recall it all but it would be possible to turn this into a small booklet, I guess.
https://typefully.com/DanHollick/qr-codes-T7tLlNi
Here's a HN discussion from 2022 about it.
https://news.ycombinator.com/item?id=32837565