This is the blog post the book came from. https://kadavy.net/blog/posts/zettelkasten-method-slip-box-digital-example/

Mixing zettlekasten with your tool of choice is a very personal choice and there's a lot of people suggesting workflows. It can get very complex very quickly especially if you add Getting Things Done. His makes a good start and is very close to what I use, except I use org-mode instead of markdown on emacs and mobile.