The document introduces the Ubuntu SDK, which can be installed via apt-get. It launches from the dash and allows creating different types of apps like simple UI, HTML5, and QtQuick2. Guidelines are provided at design.ubuntu.com and examples apps can be studied from the core apps repository. The SDK supports convergence across devices and running apps on devices or emulators. Debugging can be done on different platforms. Resources like documentation, mailing lists, and a showcase gallery are provided for additional support.