Simple explanation
When you have a big idea for an app, your instinct is to build all of it. But AI can only help you build what is clearly defined. Vague, large ideas produce vague, broken code. The version of your app that you can describe in one clear sentence is the version you can actually build and ship.
What to do
Write your full app idea in one paragraph. Then write a version of it in one sentence. Then remove half of that. The tiny version left is your first real app. Build it. Ship it. Add the rest later once you have learned how building actually works.
Copy-paste prompt
Here is my app idea: [describe your full idea]. I want to build the simplest possible first version that still does one genuinely useful thing. What should be in this first version, and what should I cut completely?
Course note
Key takeaway
Build the smallest useful version first. Then grow it.