To create a good application, you need to study for several years and understand many different techniques from Photoshop to programming. safe. Today, like websites, there are some app builders, maybe I'm wrong. The main question is what application and why should it be built? For example, my friend recently opened a flower delivery service https://distancematrix.ai/blog/what-is-geocoding. He managed to build a successful company. But the key to his app is delivery (he uses this API for that). If we're talking about video game applications, we need to take a different approach. The best advice is to seek help from an experienced professional.