I use voice dictation on my phone to transcribe notes into a Google doc, along with the page number or timestamp (for audiobooks)

My note taking process used to be either whatever I could fit in the margin (not much) or require a separate note book.

Switching to my phone has been seriously transformative. Not only is voice dictation way faster than my handwriting, but I can do it in many more contexts because I always have my phone with me. I can also take much more detailed notes in context where handwriting isn't ideal (like a jerky bus ride).