Qt is a nice platform for GUI application development. More and more people are using Qt. One of the famous Linux distros, Ubuntu, is also moving from Gnome/GTK+ to Qt. Normally, people start learning Qt from reading the Qt tutorial/books and the "hello world" example. For those who already know GTK+, learning Qt is much easier since most of the GTK+ concepts still applies. Only some "translation" is needed. This document focuses on translating your existing GTK+ knowledge and experience to Qt. So you can start to develop with Qt "immediately".