I don't think this is in the book because this is highly personal to you and what your goals are. Sonke and Luhmann had the goal of research and writing. They u

I don't think this is in the book because this is highly personal to you and what your goals are. Sonke and Luhmann had the goal of research and writing. They use their Zettelkasten to produce research which I think Sonke explains pretty well how he does it but if you aren't interested in research or writing then that's explanation is kinda useless. So how you use it will be very dependent on why you want to use it. If you're taking notes just to take notes then you will likely not get any value out of it.