The Feynman Technique

The ultimate mental model to learn anything fast and identify gaps.

"The first principle is that you must not fool yourself and you are the easiest person to fool."— Richard Feynman

Most students study by memorizing jargon. They read complex textbook sentences, repeat them in their head, and assume they understand it. But true understanding is the ability to simplify. Nobel Prize-winning physicist Richard Feynman believed that jargon is often used to mask a lack of deep understanding. He developed a simple, 4-step method to cut through jargon and master any topic.

Step 1: Choose a concept and write it down

Take a blank sheet of paper. Write the name of the topic or concept you want to learn at the top of the page.

Step 2: Explain it as if teaching a child

Write an explanation of the concept on the page. But here is the catch: write it as if you were explaining it to a 10-year-old child. Avoid technical jargon, complex terms, or heavy vocabulary. Use simple language and basic analogies. When you explain a concept to a child, you cannot hide behind big words. You have to understand the core mechanism.

"If you can't explain it simply, you don't understand it well enough."— Albert Einstein

Step 3: Identify your gaps and go back to source material

As you write your simple explanation, you will hit a wall. You might struggle to explain why a certain formula is used, or how a specific process triggers another. These friction points are the boundaries of your knowledge. This is the value of the technique: it exposes your blind spots. Go back to your textbook or lecture slides and review only those specific sections until you can explain them simply.

Step 4: Review and simplify your analogies

Read your explanation out loud. If it sounds complicated or if you find yourself using textbook definitions, simplify it further. Create a clear, relatable analogy to describe the system. (For example, explaining electricity as water flowing through pipes).

The next time you review a difficult course slide, don't read it twice. Open a blank document and write down a 3-sentence explanation of it as if teaching a child. You will find your memory retention skyrocket.