The main difficulty in developing an application is to code its functionality. For example, do text editing for a notepad application. That's what I thought when I was younger and more naive.
Since then, I have launched three applications with the hands of developers and one with my own . Not God knows what experience, but illusions have diminished. And the implementation of the functional now seems to me the simplest and most predictable task of all.
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PS I outlined in general terms what you should pay attention to. But in order to understand any of these topics, it is better to read specialized articles. And if you remember the habrostat, which well reveals any of the listed questions, share the link and I will add it to the post.