All 37 guides — searchable and filterable, every page open and free.
Featured
Activation Energy
why the first step dominates, and how to lower the friction that keeps you from starting.
The Butterfly Effect
how tiny differences in starting conditions produce wildly different outcomes.
Circle of Competence
knowing exactly where your real understanding ends, which is where catastrophe usually begins.
Entropy
why things fall apart by default, and why maintenance is never optional.
Ethos, Pathos, Logos
Aristotle's three engines of persuasion and how to use them together.
First Principles Thinking
breaking a problem to its fundamentals and reasoning up, instead of by analogy.
Hanlon's Razor
assume incompetence before malice, and you'll misdiagnose fewer problems.
Inversion
solve forward problems backward: ask what guarantees failure, then avoid it.
Occam's Razor
prefer the simplest explanation that fits, and know when simple isn't enough.
Second-Order Thinking
trace the consequences of the consequences before you act.
Survivorship Bias
why studying only the winners quietly ruins your conclusions.
The Map is Not the Territory
every model is wrong; the danger is forgetting it's a model.
Thought Experiments
how to test ideas that can't be tested physically.
Core Values
the non-negotiables that decide for you when incentives conflict.
Deliberate Practice
how experts actually improve, and why hours logged aren't the point.
The Feynman Technique
learn anything by explaining it simply enough to expose your own gaps.
How to Analyze a Business Model
a structured way to see how a company creates, delivers, and captures value.
How to Become a Great Leader
the habits and mental models the most effective leaders share.
How to Build a Moat
a practical route to durable competitive advantage (pairs with the Moats category).
How to Build Good Habits
systems, environment, and identity — not willpower.
How to Develop Strategic Thinking
turning analysis into the intuition great operators run on.
How to Focus
engineering attention when distraction is the default.
How to Learn Faster
spaced repetition, deliberate practice, interleaving, done right.
How to Make Better Decisions
the processes that separate consistently good decision-makers from everyone else.
How to Remember Everything You Read
active reading and a knowledge base that compounds.
How to Stay Motivated
motivation as a system you build, not a feeling you wait for.
How to Stop Procrastinating
why willpower fails and what design does instead.
How to Study Great Founders
turning biography into a personal operating system.
How to Think Better
mental models, biases, and clear reasoning as a practice.
Man in the Arena
Roosevelt on credit belonging to those who act, not those who criticize.
This is Water
David Foster Wallace on choosing what you pay attention to.
Life Lessons
the ideas that recur across philosophy, business, and psychology.
How to Keep Judgment When the Model Is Confident
staying the human in the loop when a system sounds certain and is sometimes wrong. → deep sample
How to Work With AI Agents
delegating real work to agents while keeping accountability, verification, and escalation.
How to Learn Fast in the AI Era
using AI as a tutor without outsourcing the understanding that makes you useful.
How to Build a Data Moat
accumulating proprietary, non-substitutable data as the durable advantage when models commoditiz
How to Keep Taste When Generation Is Free
developing the judgment to know which output is good when anyone can produce one.