This document provides an introduction to building apps for Windows 8 using various technologies including ASP.NET, Windows Phone, WPF, Silverlight, and Metro. It discusses the Windows Phone, Silverlight, WPF, and Metro frameworks. It also covers developing Metro-based apps for Windows 8 using technologies like .NET, C++, HTML5/CSS/JavaScript, and WinRT APIs. The document then summarizes the XAML framework architecture and declarative notation used for Windows 8 apps. Finally, it briefly discusses key Metro design concepts like tiles, splash screens, apps, controls, and integration with Windows features like search, share, devices, and settings.