Library
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📊Learn the Kano Model: Prioritizing Features by Customer Delight
Map your product's features onto Kano's five categories, then run a real survey with five users to surface the delighters your roadmap is missing.
🏛️Learn the Enlightenment and Its Key Thinkers
Trace the Enlightenment as a live argument between Locke, Hume, Rousseau, Voltaire, and Kant, then take your own side in a 300-word position paper grounded in their rival claims.
🏴☠️Learn the AARRR Pirate Metrics: A Startup Funnel That Scales
Walk through all five AARRR stages — Acquisition, Activation, Retention, Referral, Revenue — with real events mapped to each, then draft a working dashboard for your own product.
📊Learn SWOT Analysis Properly: Beyond the Four Boxes
Turn a lazy four-box SWOT into a rigorous, evidence-backed analysis, then pair strengths with opportunities in a TOWS matrix that produces four concrete strategic actions for any business you know.
🎯Learn SPIN Selling: Situation, Problem, Implication, Need-Payoff
Walk into your next discovery call with a scripted sequence of Situation, Problem, Implication, and Need-Payoff questions — and leave knowing exactly which ones unlocked the prospect's real pain.
🧠Learn Second-Order Thinking for Better Decisions
Stop making decisions that feel smart on Monday and wreck your Friday. You'll run real choices through a three-level 'and then what?' worksheet and leave with a decision journal template you'll actually open before the next big call.
🎲Learn Permutations vs Combinations Without Memorizing Formulas
Stop memorizing nPr and nCr — answer two questions (does order matter? can things repeat?) and the right formula falls out. Ends with you inventing and solving your own counting puzzle.
🔢Learn Modular Arithmetic Basics: Clock Math That Secures the Internet
Start with the clock on your wall and finish by encrypting a short message with a toy RSA example, using primes you pick yourself. You'll feel modular arithmetic as a living tool, not a programming operator.
📷Learn Leading Lines in Photography Composition
Train your eye to read the lines already in every scene — roads, fences, rivers, staircases — and turn them into intentional compositions. You'll finish with a cohesive five-image mini-series where every frame rides a different line type.
🏛️Learn Kant's Categorical Imperative
Turn Kant's densest idea into a tool you actually use. By the end, you'll write a maxim for a real decision, run it through the universalizability test, and journal what it reveals.
🥤Learn Jobs-to-be-Done: Why Customers 'Hire' Your Product
Learn how to run a real Jobs-to-be-Done interview and walk out with a defensible job statement — not another persona.
🧠Learn Implementation Intentions (If-Then Plans)
Turn vague goals into specific if-then plans that fire without willpower. You'll write one plan a day for two weeks and walk away with a personal library for your top three goals.
📊Learn Break-Even Analysis: When Does the Business Make Sense?
Classify the costs behind any small business, then calculate the exact unit count that turns losses into profit. Leave with a break-even chart built for your own idea, not a textbook example.
🤝Learn BATNA: Your Best Alternative in Any Negotiation
Walk into your next negotiation — salary, vendor, or lease — with your walk-away point written down, the other side's estimated, and the deal zone mapped out, so fear stops making the call.
あJapanese Hiragana Mnemonics
Lock all 46 hiragana characters plus modifiers into memory using picture-based mnemonics, then write your first Japanese words and sentences by hand.
💻Go Error Handling Idioms
Stop writing `if err != nil` on autopilot. Learn why Go treats errors as values, then wrap, sentinel, and type them until you can design a clean error story for a small CLI.
🇩🇪German Der Die Das Gender Patterns
Stop memorizing German noun gender one word at a time. Use suffix rules to predict der, die, or das for most nouns you'll ever meet.
🇫🇷French Passé Composé vs Imparfait
Stop flipping a coin between passé composé and imparfait. Build the aspect-ear that French needs — snapshot vs. ongoing, auxiliary avoir vs. être — and prove it by writing a short childhood memory where both tenses carry their own job.
📊Understand P-Values Without the Common Myths
Lock in the one-sentence correct definition of a p-value and spot the three misreadings that trip up even published scientists. Leave with a shareable mental model you can defend in any stats conversation.
🔌REST API Design Principles
Design REST APIs that teams can actually use — resources, verbs, versioning, and pagination, grounded in the conventions senior engineers argue about on PR threads.
🗡️Learn the Hero's Journey Story Structure
Walk through Campbell's hero's journey one stage at a time, anchored to scenes from Star Wars and The Matrix, then draft a one-page outline for your own protagonist.
☸️Learn the Four Noble Truths
Walk through the Four Noble Truths as a philosophical diagnosis — dukkha, its cause, its cessation, the eightfold path — with translation notes and comparative context, then apply the structure to a real problem of your own.
💼Learn Porter's Five Forces: Reading Industry Structure
Write a one-page Five Forces memo for your own market — scoring buyers, suppliers, entrants, substitutes, and rivalry the way Porter meant, using worked examples from airlines, SaaS, and coffee.
🏛️Use the Socratic Method to Think and Question Rigorously
Meet Socrates through Plato's early dialogues, walk the elenchus on justice, courage, and piety, then run your own Socratic dialogue against a belief you actually hold.