Card-like designs are seen often in UIs. Usually, a view with a white background, rounded corners, and a dark shadow that makes the view look like a card on top of another view. It gives a nice look to different view components and separates parts of UI.
Oftentimes, when developing your apps, you create a specific button style with different labels and actions to keep your UI consistent across different screens. You'll learn how to create a button view you can reuse across your app instead of having to create a new one every time.
Implementing network connectivity monitor doesn't require a lot of code. But it can mean a lot between a happy and a frustrated user.