How to remember what you read

Reading a book once is rarely enough to keep it. Without going back to it, most of the details fade. People who keep what they read tend to follow the same steps: they pick out what matters, copy it out with the page it came from, and come back to it later. This page describes those steps and how to do each one in Knowmad on iPhone and iPad.

By Oleksandr Baralei, who makes Knowmad · Updated October 18, 2026

1. Read slowly and pick what matters

Not every sentence needs keeping. Look for the ideas, facts, quotes and figures you want to have later, and leave the rest in the book.

In Knowmad: instead of highlighting, select the passage and tap New Flashcard, or collect passages from several pages and tap Finish Flashcard before you close the book.

2. Copy it out, with its page

Many readers copy passages and quotes onto note cards or into a notebook, and write down the page number so they can find them again.

In Knowmad: the text you select becomes the answer of a flashcard, and the card keeps a link to its page.

3. Turn it into a question

A passage you only read again is easy to recognize but hard to recall. A question makes you recall it.

In Knowmad: write the question yourself, or tap Generate and AI suggests one from your answer, on the device with Apple Intelligence or with your own AI key. You decide what to keep.

4. Review at growing intervals

Spaced repetition brings each card back after a wait that grows each time you remember it. Before you look at the answer, try to recall it. This is called active recall.

In Knowmad: flashcards come back after 1, 2, 3, 5, 8, 13 and 21 days, then after 34, 55, 89 days and longer. If you recall a card before you flip it, tap Remembered, and the card moves two steps forward.

5. Go back to the book

When a card no longer makes sense, read the passage around it again. The page around a passage often explains why it mattered.

In Knowmad: tap Go to Source on a card, or choose it from the ⋯ menu while you study a book's cards, to open the book at its page.

6. Use what you learn

A passage is most useful when you use it: in your work, in something you write, or in a decision. When you make a card, ask how you would use it. The answer often makes a good question for the card.

New words

When you meet a word you don't know, save it with the sentence you found it in. The sentence shows how the word is used and helps you recall the word later.

In Knowmad: select the word and tap Define. You get a definition in simple words or a translation, and the sentence becomes the word's first example. Words come back for review at the same intervals as flashcards.

Writing flashcards you can recall

• One idea per card. An answer that is a long list is hard to recall in full. Split it into several cards.
• A specific question. It should be clear what the card is asking for.
• A short answer. Keep the words that matter. In Knowmad, tap Refine and AI makes an answer concise or turns it into key points.
• The figure, when the figure is the point. In Knowmad, tap Crop and drag a rectangle over a diagram, formula or figure to use it as the question or the answer.
• Fix cards you keep forgetting. A card you often forget is usually too vague or too long. In Knowmad, you can edit a card during the review.
• Your own cards. Making a card yourself is part of learning it. In Knowmad, you make every card from a selection or by typing it; the app never creates cards on its own.

An example

Passage

Try to recall the answer before you look. Each try makes the memory stronger.

Weak question

What does the book say about memory?

Better question

What makes a memory stronger each time?

Answer

Trying to recall it before you look.

The weak question has many possible answers. The better one asks for one fact, and its answer is short enough to recall in full.

Note cards, a commonplace book or flashcards?

A commonplace book is a notebook or a box of note cards where readers collect passages and quotes, often sorted by theme. Flashcards add two things: a question that makes you recall the passage, and a schedule that brings it back for review.

Knowmad makes flashcards rather than a commonplace book. Cards are kept by book, and books by folder. It doesn't sort cards by theme across books, and it doesn't keep free notes.

See How Knowmad works for every step in detail.