Six business models, and how each one changes everything downstream.

Ideas are cheap; disqualifying them fast is the skill.

Find the hole, not the market.

Interview without collecting flattering lies.

Prove money already flows to products shaped like yours.

Choose who you're for, and what you refuse to be.

The minimum thing that tests YOUR specific risk.

Write down what you're not building.

Why they come back tomorrow, decided at the data-model level.

Get a stranger to their first moment of value.

Information architecture, flows, states, and the eight-state rule.

How non-designers ship interfaces that look designed.

Identity as competitive strategy, not decoration.

Motivation mechanics, and the line you don't cross.

The boring stack you can debug beats the modern one you can't.

Invariants machines enforce, not ones you remember.

Rendering, caching, and the service-worker mistakes you can't undo.

Six details make an app feel native; one costs you two days.

Offline-first, and the half of sync you'll forget to build.

Model facts, not positions.

The six auth states, and the one everyone ships broken.

Depending on someone else's uptime, pricing, and roadmap.

Cost, latency, evaluation, and the failure modes.

Prompts as versioned, tested product surface.

Gate depth, not function. Never gate the habit.

Position on a scale your market already set.

The stub that gave every user a free subscription.

A check that couldn't have failed isn't a check.

The expensive bugs are the silent ones.

Finding issues is easy; the mechanism to fix them is the work.

Your architecture sets your cost curve before you have users.

When content is the product, engineer it.

Pipelines that fail loudly instead of lying.

Hosting, DNS, and the site that gates your submission.

Why your email silently disappears.

Rejection is usually a wording problem.

Cheaper to enter, slower to launch.

Instrument before you have users, data isn't retroactive.

Entity, IP, contracts, and co-founder terms.

GDPR, CCPA, COPPA, store labels, what they demand.

Sales tax, VAT, merchant of record, runway.

Support as a product-research channel.

Say what it is, in words your customer uses.

Build demand before you have a product.

Stores, Product Hunt, and the day nothing happens.

Compounding channels, and how long they take.

The channel that actually works for consumer apps.

Why you shouldn't start here, and how to when you do.

Six numbers before product-market fit.

The only growth that compounds.

Loops beat funnels; testing without fooling yourself.

Your first four hires, and AI as leverage.

Deciding, prioritising, and not burning out.

Every tool, price, template and prompt in one place.