I think there are multiple ways to do it. These are what I can think of. * Re-read the books * Summarize the book in one sentence or a short paragraph * Crea

I think there are multiple ways to do it. These are what I can think of. * Re-read the books * Summarize the book in one sentence or a short paragraph * Create or visualize the idea or important points in the books, like https://sketches.sachachua.com/static/2022-08-03-01%20Four%20Thousand%20Weeks%3A%20Time%20Management%20for%20Mortals%20-%20Oliver%20Burkeman%202021%20%23visual-book-notes%20%23philosophy%20%23time-management%20%23life.png https://sketches.sachachua.com/static/2022-08-03-01%20Four%2... Last but not least, I recommend to read a book called "How to Read a Book" by Mortimer J. Adler. Different books have different strategies to read.