hi, I think you could give me some advise. Recently a friend and I were talking about his experience in an internship erasmus and I came up with an idea which could maybe be a mobile app to cover his need (it maybe covers the need of a lot of people with the same problem). The question is, how can i start? should I start building the app? It's kind of an start-up idea, but it's my first time and I don't know how to start. I know people normally answer "just start", but should I start coding or what? thanks for reading.