How to capture book notes from a physical book into your second brain (without using Readwise)

Capturing insights from physical books into a “second brain” doesn’t require automated clipping tools like Readwise; it can work better with a slower, more selective workflow that forces readers to decide what truly resonates. The core idea is to mark up the book once—without bouncing between paper and digital—then convert only the most meaningful parts into a structured digital notes system. That selectivity matters because easy transfer encourages capturing everything, which leads to information overload rather than usable insight.

The process starts during the first reading. The reader marks the physical book using four signals: underline, highlight, a star, and dog ears (page-corner folds). Underlines represent basic resonance—like a quick “thumbs up” on a passage. Highlights are for excerpts worth sharing with others. Stars indicate something deeper: a core belief, a life theme, or an idea the reader has been actively thinking about. Dog ears are reserved for the few moments the reader would “absolutely regret” not saving. Importantly, the system is designed so that the number of marks should shrink as the reader moves from underline to dog ears; the strongest material earns the strongest treatment.

After finishing the book, the reader returns to reflect on the marked sections and then transfers content into digital notes. Instead of starting with everything underlined, the conversion begins with dog ears—the highest-value items. In the digital system, the reader creates two kinds of entries: “thoughts” (personal interpretations or reactions to quotes and passages) and “quotes” (verbatim lines that the reader couldn’t improve upon and wants to keep for later inspiration). Each book gets a dedicated note, while each thought and each quote gets its own separate note.

The workflow is built around Craft, using bi-directional linking so individual quote/thought notes connect back to the book note. This structure turns each quote or thought into a modular “Lego piece” that can be reused across future projects—whether those projects are new reading, writing, or other creative work. As the reader writes and links notes, they also begin to see relationships: where else the same idea has appeared, which other notes it connects to, and what themes it overlaps with in life.

A key reason for avoiding Readwise-style convenience is friction. Automated or effortless capture can make it tempting to highlight everything, like filling a plate at a buffet until it stops being enjoyable. By requiring manual typing of only the most resonant material, the reader creates a deliberate pause between consuming and saving. That slower approach helps ensure the digital library contains notes that reliably generate energy later—because each entry earned its place during reflection, not just during impulse highlighting.