S1 · L072:33
The Cobra Problem
Measure what changes decisions, align on a North Star, respect retention, and never reward a number without a guardrail.
Metrics
Glossary
Guardrail metric
A metric you protect while pushing a target, so you don't win the number and lose the goal. For example: grow sign-ups while keeping first-week retention healthy.
Learn it in a lesson
S2 · L061:58The Glasses That Launched Too Loudly
Launch to the right people, in the right setting, in growing rings: earn quiet proof before you make a loud promise.
Growth
S2 · L112:04The Shopkeeper's Scale
Keep an honest scale: short-term tricks borrow from long-term trust, and the interest is always higher than you think.
Design