In post 4/4, Kristine shows how to wrap the work of the previous blog posts into a reusable component.
The main benefits of components are
Instead of changing, e.g., the navigation on several screens in an app, with a component the change can be performed at one central place. Also, if you want to reuse the navigation built in this blog series, you can export it as component and use it in as many apps as you want.