If you have followed the last chapters in this book, then you will probably have an app with similar screens. You can use these newly learned things to improve the app even more. Don't forget to use open source libraries when developing. This is a great boost and a time saver.
This was the last chapter, but we have a bonus one for you. It's about GitHub and how to contribute to a swift (open source) project hosted there. When we are using some open source libraries for free, not everything in them is working as we expect or how we would like. Thus, it's a nice thing to know how to extend such a library and how to bring the fixes back to the project. We will discuss the whole process for this in the bonus chapter.