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Most founders waste their first year building something nobody wants. Here's the counterintuitive lesson from YC that changed how I think about startups: 🧵

The biggest mistake? Falling in love with your solution before understanding the problem. You need to talk to 100 users before writing a single line of product code.

YC's most important rule: Do things that don't scale. Manually onboard your first 10 customers. Personally answer every support ticket. This is how you learn what really matters.

The best founders obsess over one metric: retention. Not signups, not MRR — retention. If people come back, you have something. If they don't, nothing else matters.