I read on Kindle because all my highlights are automatically digitized. You can access your device’s Kindle notes here or use software like Readwise. I’ve found Readwise has a more robust search feature across the Kindle books in your library. It also has neat automations that surface your past highlights to review at an optimally timed cadence (using spaced repetition). As a result, Readwise can help to integrate your favorite book highlights and notes into your working knowledge.
Source: Ben Meer