Check out this video done by Open Source Games that walks through all of the demo samples.Get Started
Build games for Windows, MacOSX, Linux, iOS, and Android on our supported host platforms: Windows, MacOSX, or Linux.
Use your favourite build tools: CMake, Visual Studio, XCode or Qt Creator. How's that for flexibility?
Use the cross platform new game project script to get something up and running. Use the API docs, Wiki, and community discussion group to help you out.