A huge time-waster is not knowing what you are selling. Have a default, but never NULL or undefined. My default is toothpicks. You’d think there is no money in it. You’d be wrong. Ex-finance dudes are selling 50 EUR packages of toothpicks. Planting 100 trees for every one they cut down. Paying over 90 cents per pick is about how it impacts your life and those around you. Modern toothpicks are as much about the meditative state they put you in, way beyond historical utility value. Slow down, it’s about picking the right next move while saving the planet.