Foundations
Asymmetry, inversion, map vs. territory: the first models that reorder how you see any problem.
Mental Models
The latticework of thinking
Astro · React · Tailwind · MDX2026Alejandro Fernández Camello
An interactive site that teaches mental models - the cross-disciplinary thinking tools great decision-makers use - from zero to expert, not by memorising definitions but by grabbing the idea and feeling how it moves.
A latticework, not a list
Every course depends only on earlier ones. You never hit an unexplained concept: models chain together from beginner to expert.
Grab the idea and move it
Compounding is the most famous model and the worst-intuited. Drag the rate and watch the linear turn exponential.
Compounding30 years
8%
Starting capital
€1,000
After 30 years
€10,063
×
10.1×
Doubling the rate doesn’t double the result - it multiplies it. That is the whole power, and the whole trap, of compounding.
Nine learning paths
Models cluster into thematic routes. You start at the foundations and climb toward strategy.
Decision-making
Opportunity cost, sunk cost and expected value to choose better under uncertainty.
Probability
Bayes, base rates and fat tails: thinking in distributions, not certainties.
Human psychology
Biases, incentives and heuristics that govern how we decide - often without noticing.
Systems thinking
Feedback loops, stocks, flows and second-order effects in complex systems.
Strategy
Game theory, mechanism design and fitness landscapes to play multi-player games.
Start at the foundations
Free forever, no accounts, no ads and open source. Bilingual: English and Spanish at full parity.