Fall in Love with the Problem, Not the Solution: A Handbook for Entrepreneurs

The most important mental model for product builders. Levine's core principle—fall in love with the problem, not your solution—prevents the trap of building things nobody wants. His frameworks for validating problems, testing solutions fast, and knowing when to pivot are battle-tested from building multiple unicorns. Essential for avoiding the #1 startup killer: solving problems nobody has. Especially critical in AI where building is so fast you can waste months on wrong solutions.