Fundamentals for building successful apps

The most surprising thing about building successful apps, according to someone who has done it repeatedly, is that you can start with almost nothing but domain knowledge. "I think you could just start prompting and just prompt your way to making something and sell," one builder explains. "I think people underestimate the knowledge they already have. So like if you have like a deep domain knowledge you probably have like tons of ideas already on what to build and you probably have like a winning idea already that you could just prompt your way and start building."

This runs counter to the common assumption that you need technical expertise, a novel insight, or some kind of special access to build something people want. The actual bottleneck, according to this view, is not skill or resources — it's recognizing that your existing expertise is the raw material.

Domain knowledge as the real moat

The core mechanism here is that domain knowledge gives you two things that outsiders lack: problem awareness and solution plausibility. If you have spent years working in a specific industry, you know what is broken, what people complain about, and what they would pay to fix. You also have a reasonable sense of whether a proposed solution would actually work in practice, because you understand the constraints and incentives of that world.