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24 key learnings on learning itself: how memory works, the study methods that hold up, and the habits that build expertise. Each takes about 40 seconds to read. Swipe, use the arrows, or your keyboard.
All 24 learnings · one per slide
Peter Hollins, in bytes
24 key learnings on how to learn faster, remember longer and build real expertise.
Learning 1
The idea
Most of us were taught what to learn, but never how. Hollins argues that learning itself is a skill with methods you can practise and improve.
In real life
Two people study for the same certification for the same hours. The one using proven techniques passes with time to spare.
Takeaway
Before your next course, spend an hour learning how to learn. It pays back every time.
Learning 2
The idea
The brain learns best when the body is cared for. Sleep, movement, food and hydration all affect focus and memory.
In real life
A tired professional rereads the same page five times; after a good night's sleep, it makes sense on the first read.
Takeaway
Protect sleep before a big learning push. It is when memories are consolidated.
Learning 3
The idea
Drawing on Carol Dweck's research, the book stresses that believing ability can grow makes people persist longer and learn more.
In real life
Someone who thinks “I'm just not a numbers person” gives up on spreadsheets; someone who thinks “I'm not good at this yet” keeps practising.
Takeaway
Add “yet” to your self-limiting statements. Ability grows with effort.
Learning 4
The idea
Where you learn shapes how well you learn. A calm, organised space with fewer distractions makes focus easier.
In real life
Studying with your phone in another room produces noticeably better concentration than with it face-down on the desk.
Takeaway
Remove distractions before you start, rather than relying on willpower.
Learning 5
The idea
Memories are built as connections in the brain that strengthen each time they are used. Unused connections fade.
In real life
A language you used every day at school feels rusty after years without practice, but returns quickly once you use it again.
Takeaway
Memory is use-it-or-lose-it. Plan to revisit what you want to keep.
Learning 6
The idea
Research going back to Hermann Ebbinghaus shows we forget much of new material within days unless we review it.
In real life
After a training session, most of the content is gone a week later if nobody revisits it.
Takeaway
Expect forgetting, and schedule reviews to beat it.
Learning 7
The idea
Reviewing material at spaced intervals, after a day, then a few days, then a week, builds far stronger memory than one long session.
In real life
Twenty minutes a day for a week beats a three-hour session the night before an exam.
Takeaway
Spread study across days. Short, spaced sessions win.
Learning 8
The idea
Pulling information out of memory, by testing yourself, strengthens it far more than rereading or highlighting.
In real life
Closing the book and writing down everything you remember is more effective than reading the chapter again.
Takeaway
Test yourself often. Recall is where learning happens.
Learning 9
The idea
Mixing different topics or problem types in one session feels harder, but builds deeper understanding than practising one type at a time.
In real life
A student who mixes accounting problem types in practice handles a mixed exam paper far better than one who practised each type in blocks.
Takeaway
Mix it up. Difficulty during practice often means learning is happening.
Learning 10
The idea
Named after physicist Richard Feynman: explain a concept in simple words as if to a beginner. Where you get stuck shows what you don't yet understand.
In real life
Explaining a complex system process to a new hire quickly reveals the steps you were vague about.
Takeaway
If you can't explain it simply, go back and fill the gaps.
Learning 11
The idea
Teaching others forces you to organise knowledge, find gaps and recall it actively. People often learn more by preparing to teach than by studying alone.
In real life
A consultant who runs a training session on a topic usually understands it better afterwards than before.
Takeaway
Share what you're learning: a post, a talk, a lesson for a colleague.
Learning 12
The idea
Asking why something is true connects new facts to what you already know, making them more meaningful and easier to remember.
In real life
Memorising a rule is fragile; understanding why the rule exists lets you apply it in situations you have never seen.
Takeaway
For every new fact, ask why it is so, and how it links to what you know.
Learning 13
The idea
Facts are easier to remember when they hang on a framework. Understanding the underlying principles lets you rebuild details you forget.
In real life
Someone who understands double-entry bookkeeping can work out an unfamiliar journal entry instead of looking it up.
Takeaway
Find the big idea first, then add the details to it.
Learning 14
The idea
Rereading and highlighting feel productive, but create an illusion of knowing. Active work such as summarising, questioning and solving builds real understanding.
In real life
After highlighting half a chapter, you can recognise the material but can't explain it.
Takeaway
Swap the highlighter for questions you answer from memory.
Learning 15
The idea
Focus fades with time. Hollins suggests not studying much beyond about 50 minutes without a break, and stepping away often helps ideas settle.
In real life
Einstein is said to have played the violin when stuck on a problem, returning with fresh ideas.
Takeaway
Work in focused blocks with real breaks. Rest is part of learning.
Learning 16
The idea
Procrastination often comes from a task feeling too big or vague. Breaking it into small, specific first steps makes starting easy.
In real life
“Study for the exam” gets postponed; “answer ten practice questions on topic 3” gets done.
Takeaway
Make the first step so small it would be silly not to start.
Learning 17
The idea
The idea that people learn best only in their preferred style, visual, auditory or kinaesthetic, is not supported by good evidence.
In real life
Someone who only watches videos because they are a “visual learner” misses the benefit of practice and self-testing.
Takeaway
Match the method to the material, not to a label about yourself.
Learning 18
The idea
Cramming can get you through tomorrow's test, but most of it is forgotten soon after. It also feels more effective than it is.
In real life
A crammed certification is passed, then forgotten by the time you need it on a project.
Takeaway
If you want to keep it, space it out. Cramming is renting, not owning.
Learning 19
The idea
Expertise comes from focused practice on your weaknesses, with clear goals and feedback, not just repeating what you can already do.
In real life
A presenter who records and reviews every talk improves faster than one who simply gives more talks.
Takeaway
Practise at the edge of your ability, and get feedback every time.
Learning 20
The idea
Struggling with a problem before being shown the solution can lead to deeper learning, even when the first attempts fail.
In real life
Trying to build a report yourself before watching the tutorial makes the tutorial far more useful.
Takeaway
Attempt first, then learn the answer. The struggle prepares the mind.
Learning 21
The idea
Hollins applies the Pareto principle: a small share of material often gives most of the practical value. Focus there first, though some readers find this oversimplifies.
In real life
Learning the 300 most common words of a language gets you through far more conversations than random vocabulary.
Takeaway
Find the vital few concepts first, then go deeper.
Learning 22
The idea
Knowing that you know something is different from being able to use it. Check your understanding by applying it, explaining it and predicting with it.
In real life
You can define a term, but can you use it to solve a new problem or spot when it's misapplied?
Takeaway
Push past recognition. Ask: could I use this tomorrow?
Learning 23
The idea
Structured note-taking, such as the Cornell method with cues and summaries, turns notes into a tool for review and self-testing.
In real life
Writing questions in the margin of your notes lets you quiz yourself later instead of just rereading.
Takeaway
Write notes you can test yourself from, not just copies of the slides.
Learning 24
The idea
The popular 10,000-hour rule oversimplifies. What matters is the quality of practice, feedback and persistence, not hours alone.
In real life
Two people with ten years' experience: one has grown every year, the other repeated the same year ten times.
Takeaway
Count improvement, not hours. Keep raising the bar.
All 24 learnings complete
Learning is a skill too. Which technique will you try on the next thing you study?
Summaries are written in my own words for learning. Read The Science of Accelerated Learning by Peter Hollins (2017) for the full stories. More Books in Bytes
