I have been a CLI programmer, and recently I found it will be a plus to learn GUI programming. In past, my experience and knowlegde was a bit messy. So you may imagine many detour were there in my way, that is true. And I want to avoid getting lost again if possible. When googling about existing GUI framework, I found it is hard to choose my start point from GTK, QT, and lot of less famous peers. What are important factors when you guys are facing that problem? Will it be a good idea to pick a small enough library and feel its fundamental ideas?