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How to Take Notes While Reading a Textbook

Eli Tanaka · · 3 min read

Reading a textbook with a highlighter is not the same as taking notes from it. Highlighting gives you a colorful book and roughly the same recall you'd have from reading it once with no pen at all. To actually learn from a textbook, you need notes you'll come back to.

The wrong default

Most students read a textbook chapter linearly, highlighting as they go, then close the book and think I read it. A week later, they remember almost nothing.

The problem is that reading creates familiarity, not retrieval. Without a retrieval pass, the material slides away. Notes are useful because they force retrieval at the time of reading and provide retrieval cues for later.

A workable reading-and-notes process

For each section of a chapter (not the whole chapter at once):

  1. Read it once without writing or highlighting. Just focus on understanding.
  2. Close the book. Write three to five short notes from memory in your own words. Question form is great. Bullet points are fine.
  3. Open the book and patch the notes. What did you forget? What did you summarize wrong? Fix it.
  4. Highlight only what's worth memorizing later (a precise definition, a key formula). Skip highlighting general ideas.

That's the loop. It feels slow because it includes thinking. The thinking is the work.

What good textbook notes look like

For most subjects, question-and-answer pairs are the best format. They double as study material later.

Q: What does the law of supply state?
A: When prices rise, suppliers produce more, all else equal. The relationship is positive.

Q: What's the difference between movement along a supply curve and a shift of the curve?
A: Movement = change in quantity supplied at a different price. Shift = the whole curve moves because something other than price changed (cost, technology, etc.).

That's a useful note. You can review it next month by covering the answer.

This is also what a worse version looks like:

- supply curve, p. 47
- law of supply (positive relationship)
- shift vs movement

Those notes are bookmarks, not notes. You can't review them.

When to skim, when to deep-read

Not every chapter deserves the full retrieval pass. A reasonable rule:

  • First exposure to a topic: full pass with notes.
  • Re-reading a familiar topic for review: skim, no notes.
  • Reference look-up: find the section, take what you need, no notes.

Trying to take detailed notes on every page of a textbook is how students burn out on reading by week three. Reserve the full process for the parts that warrant it.

Don't skip the marginalia

Even when you're not doing the full Q&A pass, write in the margins. Short questions ("why is this true?"), reactions ("doesn't this contradict ch. 2?"), connections ("see lecture 4"). Marginalia keep you in active conversation with the text. They cost a few seconds per page and dramatically improve retention.

You bought the book. Write in it.

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