App ideas often start broadly: learn languages better, work faster, organise everything. Those are useful directions, but they do not tell you what belongs on the first screen. I prefer to bring an idea back to a concrete job someone can finish.
Try this template: who is in what situation, trying to do what, and facing which obstacle? A hypothetical learner encounters a word while reading, wants its meaning and wants to save it for review. That sentence suggests a flow; “build a complete learning platform” does not.
Draw the shortest path from opening the tool to finishing the job. In this example it is entering a word, reading its meaning, saving it and finding it again. Each step needs a clear indication of success or what to do next.
Separate what is needed now from what can wait. Lookup and saving belong to the main flow. Decorative profiles, leaderboards and a large statistics screen can come later. This does not make them worthless; it prevents building around a core you have not yet tested.
Define completion through observable actions: someone can find a saved word after closing and reopening the app. That is easier to test than “a smooth experience”. Include missing results and incorrect input, not just a successful attempt.
Try it: take an idea and write one need, one main flow and a not-yet list. If you still cannot identify the first screen, narrow the situation further. Clear scope leaves room for quality instead of simply accumulating features.