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The best place to start learning how to write apps for the Universal Windows Platform (UWP) is with layout and navigation. Adaptive layouts and adaptive triggers allow an app to look great on any device and on any screen size; navigation allows you to implement common UI paradigms such as the hub pattern and master-detail views. Start your journey to UWP enlightenment with this introductory video from Scott J. Peterson, and use the concepts presented here in UWP apps of your own.