How to Write a Book Summary (Step-by-Step)

In 2015, I wrote a book summary for The War of Art by Steven Pressfield. 

Distilling the book’s key ideas helped me remember what I read. Plus, readers got a lot from it, so I continued with other nonfiction books I read.

Since then, I’ve written 100+ book summaries for the best non-fiction books of all time. And, in doing so, I’ve learned a thing or two about writing good book summaries.  

In this article, I want to share how to write a book summary that will help you remember what you read months, even years, after reading.

Table of Contents

• Why Write a Book Summary?
• How to Write a Book Summary (Step-by-Step)
  • Step 1. Take Notes While You’re Reading
  • Step 2. Write the Main Takeaways in Your Own Words
  • Step 3. Continue to Summarize Overtime 
• Conclusion

Why Write a Book Summary?

I’ve found there are three key benefits to writing a book summary.

First, writing a book summary helps you remember what you read. We’ve all read a book only to forget its key ideas as soon as we finish. Summarizing a book in your own words, though, minimizes that problem by helping you internalize the book’s key insights. 

Second, writing a book summary helps you connect key concepts from other books. When writing a book summary for The Little Book of Yes, I noticed the author wrote about the importance of endings, a key idea also covered in The Power of Moments.

In The Power of Moments, Chip and Dan Heath explain that when people assess an experience, such as an experience with a brand, they tend to rate the experience based on the ending. In The Little Book of Yes, by contrast, Noah Goldstein discusses endings in the context of persuasion. 

By summarizing an idea, in my own words, and then looking at that idea through the lens of another context, I was able to understand it on a deeper, more applicable layer. 

Granted, for ideas covered, again and again, there’s a risk of moving too far from the source. (Think of all the instances of “research shows that” with no reference.) 

But for principle-based ideas (e.g., the trichotomy of control), connecting “knowledge trees,” as author James Clear calls them, helps you internalize and remember what you read.

Third, writing a book summary helps you improve your writing. As Head of Content for Sleeknote, I create a lot of content and need to refer to and reference ideas I’ve read as quickly as possible. 

In this article on copywriting examples, I wanted to talk about how copywriter Claude Hopkins saved Schlitz from bankruptcy. Still, I couldn’t remember which book had introduced me to the story. 

So, I ran a search in my Commonplace Book, found the book, (Scientific Advertising), and featured the story in my article.   

You might not be a writer or even a creative for that matter, but as we’ll discuss in Step 3., there’s value in “remixing” an idea as part of the retrieval process. 

How to Write a Book Summary (Step-by-Step)

Now we’ve covered the benefits of writing a book summary let’s discuss how to write a summary, step-by-step.

Step 1. Take Notes While You Read

If you’re reading a print or hardcover book, highlight important quotes, ideas, or questions, and then write the page number on the first blank page.

By contrast, if you’re reading a Kindle book, use Kindle’s “notes” and “highlights” to capture and save important takeaways. Try to be as descriptive as possible to save time when exporting.

When reading Drive by Dan H. Pink, I marked a popular highlight.

But I also added a note, so when I summarized Drive, weeks, or even months later, I knew who Pink was quoting.

I also recommend highlighting the book’s chapter headings as you’re reading. You won’t always write a book summary, chapter by chapter, but for certain books, where each chapter builds on the last, it’s much easier to get an overview of your notes and highlights.

Step 2. Write the Main Takeaways in Your Own Words

If you’re reading a print or hardcover book, write your notes and highlights into your preferred word processor or note-taking app. (I recommend Notion for reasons I’ll mention in Step 3.)

However, if you’re reading a Kindle book, adding your notes and highlights is quicker and easier. To export your notes and highlights, go to Your Amazon Kindle page. 

Next, copy all your notes and highlights and paste them into a preferred word processor or note-taking app. For this tutorial, I’m using Notion.

Then, remove all instances of “Read more at location [NUMBER],” “Delete this highlight,” and “Add a note” to remove all redundant copy.

Next, rewrite each highlight in your own words. If a highlight lacks context, like the example I mentioned in Step 1., rewrite it to include the note.

For example, before rewriting, this highlight read, “‘When money is used as an external reward for some activity, the subjects lose intrinsic interest for the activity,’ he wrote.” 

However, after editing, it became, “In one study, Edward Deci found that when money is used as an external reward for some activity, subjects lost intrinsic interest for the activity.”

If you highlighted chapter headings, as suggested in Step 1., turn them into subheadings. I also suggest adding a divider to separate each block. 

Step 3. Continue to Summarize Overtime 

One of the best book summarization practices is called progressive summarization (PS). Coined by Tiago Forte, the idea is to summarize your notes, and then summarize that summary, then summarizing that summary, distilling the ideas into smaller and smaller layers each time.

There are five layers to PS, but I’ve adapted it for a book summary, specifically.

First, we have layer 1, which is a book’s notes and highlight, unedited, including redundant copy like “Add a note.” The problem, though, as mentioned previously, is raw notes lack context and are therefore unhelpful when we return to them in the future.

Layer 2, the first round of summarization, solves that problem, with a summary of the book, in your own words.

Layer 3 is the second round of summarization. Forte recommends bolding the book’s big ideas at this layer, but I use highlights instead for reasons I’ll explain in a moment.

At layer 3, I highlight key takeaways that are not context-specific.

Next, for Layer 4, I bold what I call “Directives.” These are bite-sized instructions that “tell” you what to do. Here’s a Layer 3 example (highlights) with Level 4 (bold) added after a fourth revision.

At this stage, if I notice an idea that’s similar to one in another book, I use Notion’s callout box feature to draw attention and link it to the book summary for reference.

Finally, for a tiny minority of book summaries I write, I “remix” them by combining them with another idea for a piece of content. Remixing is a Layer 5 practice.

For instance, for one of my weekly Words Into Works newsletters, I knew I wanted to share a story about Abraham Lincoln, which Ryan Holiday introduced me to in his book, The Daily Stoic. 

I also knew I wanted to use the story to illustrate the idea of pausing, an idea I learned from The Little Book of Yes. So I combined Holiday’s story with Goldstein’s idea and added a creative spin to help me internalize the idea.

I should mention progressive summarization is done best over time. You shouldn’t go through all five levels for a summary in one sitting, nor will you need to. 

But for a select few, you will return, again and again, over time, and improve on the summary you wrote, often with a greater understanding than when you first wrote it.

Conclusion

Writing a book summary requires time, energy, and effort. That much is a given. But when done consistently, over time, it’s one of the best investments you can make in yourself.