Also from me a clear recommendation. I have read the original in German, it is very good to read, entertaining and yet has depth. Suitable for all those who want to structure their work or thoughts better.

Btw, there is an own homepage of the book: https://takesmartnotes.com/

I'm just finishing this book, and I echo the recommendation. In fact, when I bought the book, I didn't know it was about Zettelkasten. This book won't satisfy those looking for concrete examples, but it will give you a lot of specifics and whys. Obviously, I'm in the early adopter stage at the moment, but what I'm reading fits my problem space (tons of notes, but I can't seem to find what I want, and I re-do research periodically because of it).

Seconded, it's a really well written compact book.

It's possible to tweak deft and org-mode a bit with some functions to make it very Zettelkasten like: https://efls.github.io/zetteldeft