Switching from Visual c++ to linux ??
 

I was wondering how difficult is it for someone who knows windows c++ to switch to linux.
What are my options I've heard QT is very popular and where should I start?

Visual C++ is just an IDE isn't it? If you mean toolkits for creating GUIs, there are several. Qt is a C++ toolkit, there's also GTK+ (which is in C, but has C++ bindings), wxWidgets, FLTK and perhaps others. I'm not really sure about which is "better" (or what the differences between them are). All of those have some kind of tutorial/getting started guides on their websites. You'll probably have one or both of Qt and GTK+ installed, but will likely need to install the others yourself if you want to use them.

"Visual" programming? okay I'm pretty new to the programming field in terms of competence but try using Eclipse or Kdevelop like I did in my Fedora Core days.

The main thing to learn though is that leaving one line of code to a machine impears your abillites.

Going from Visual C++ to Linux-based C++ programming wouldn't be that big of a step. The only difference between the two is that Visual C++ is managed-mode, and relies upon the programmer to spend a fair bit of money of the Windows GUI API.

Linux-based C++ programming is a little friendlier - no-one has any great monetary profit to turn from privatizing the code, so the sources and documentation (APIs, if you will) are freely and easily available.

It's quite simply just learning a new set of classes and interfaces, and the whatnot.

EDIT:
If you're looking for a parallel on the IDE front, there are countless contenders. Anjuta (C/C++), KDevelop (C++), motor (text-based, C/C++/Java), Netbeans (Java/C++), Eclipse (Java/C++/C/Python), ..., and countless others.

Actually If you're looking for some thing to type code into Kate or Gedit (especially kate) would be quit good since they can both act like IDE's but take up less ram and don't mess you around asking what sort of program you want and don't try to tell you how to write it.