My impression was that gtk has pretty reasonable tutorials, at least for those languages with official bindings. Once you go through tutorial, you can examine

My impression was that gtk has pretty reasonable tutorials, at least for those languages with official bindings. Once you go through tutorial, you can examine gtk-widget-factory app and gtk-demo app for further ideas how to implement common stuff. Or just take a peek at source code of an application that does something that you would like to replicate, even if it is written in a different language the knowledge is easily transferable.