IME the hard thing is not something that there's accessible examples for. If there's a tutorial or an example project, you'll figure it out eventually.

The thing that's hard is something like how to make a project maintainable. You have to have the experience of screwing it up over a long period of time, feeling the pain each time there's a bug to find or a new feature to implement. You won't find a tutorial in how to do this, because the pain is a necessity to learning.