Prove your idea sells before you build anything

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You have an idea. It's been living in your head for weeks, maybe months. You've told a few people about it, and they nodded and said it sounded interesting. Now you're staring at a blank page, a domain name you haven't bought yet, and a decision you keep postponing. Should you build it? Should you spend the next six months of your life on it? Here's the honest answer: you don't know yet. And you won't know until you test it. Most first-time founders skip this step because testing feels slower than building. It isn't. Building the wrong thing for six months is slower. Much slower.