Overview
Fast learning isn't about speed-reading or cramming; it's about using how memory and understanding actually work. A few principles — active recall, first-principles understanding, and spaced repetition — do most of the heavy lifting.
This guide distils them into a practical approach.
The steps
Understand from first principles
Don't memorise — rebuild the idea from its fundamentals using first principles, so it's understood, not parroted.
Focus on the vital 20%
Apply the Pareto principle: a small core of concepts unlocks most of a subject. Learn those first.
Test yourself, don't reread
Active recall beats passive review. Close the book and try to explain the idea — struggling to retrieve it is what builds memory.
Attach new ideas to models you have
Connect what you're learning to your existing [mental models](mental-models) so it has somewhere to stick.
Watch diminishing returns
Per diminishing returns, the tenth hour on one topic adds little — know when to move on.
Learn from the best examples
Study how masters worked — the [people library](people) exists so you can learn directly from them.
Key takeaways
- Understanding beats memorising — rebuild ideas from fundamentals.
- Test yourself instead of rereading; retrieval builds memory.
- Learn the vital 20% of a subject first.
- Connect new knowledge to models you already hold.
Frequently asked questions
Why is active recall better than rereading?
Because the effort of retrieving something from memory strengthens it, whereas rereading feels productive but mostly builds familiarity, not recall.
Where should I start with a new subject?
With its core 20% — the handful of concepts everything else builds on — understood from first principles rather than memorised.