Any Windows Store app can be used in a variety of devices with different screen sizes and resolutions. You should develop your app such that it renders well on all screens. Based on your app’s core features, you can restrict the orientations supported in the app by selecting a specific orientation in the package manifest.
The Grid control can create a flexible and fluid layout. In situations where content is likely to overflow the visible area, use the ScrollViewer control.
For displaying content with pictures or hyperlinks, for example, consider using the RichTextBlock control with the RichTextBlockOverflow companion control.
The top app bar provides navigation among various sections of an app.
The bottom app provides access to commands ...