Measuring What Matters
Vanity metrics feel productive. Activation, retention, and revenue per cohort are the only three that move the business. Everything else is a distraction wearing a chart.
If you have a dashboard with 40 numbers on it, you have no dashboard. You have a wall.
Pick three numbers. Make them load in under a second. Look at them every morning. When one moves, you'll know which lever moved it, because there are only three.