Windows developer documentation moved to docs.microsoft.com. Microsoft has also included the docs for the UWP APIs, Microsoft Edge, and Cortana on docs.microsoft.com. Microsoft is also open sourcing all developer documentation so that community can make contributions.
You get everything you need to create your first UWP app in one place. Discover the latest features in Windows 10 for developers, and then learn how to use them in your apps. In addition to new and updated docs, company created a new Code Samples page to help you find the Windows samples on GitHub. There are a bunch of samples already available, and able to easily find them by narrowing down your search criteria by technology area, language, and platform.