I need to start learning OpenGL now and the book I read (C++-GUI-Programming-with-Qt-4-2nd Edition) covers it in chapter 20 while I'm now reading chapter 5!

1- What are the benefits of learning OpenGL "with" Qt?
2- What should I read to be familiar with Qt OpenGl? Preferably a step-by-step book/tut.
Docs haven't helped me so far except for seeing a function of a given class. So if there is a good tut apart from docs, I will be very happy to have that.

3- What's your opinion about this tut? Would you agree if I continue reading the book and starting it at the same time.

Overall, what would your suggestions be for a C++/Qt programmer that likes to start OpenGL?

Thanks.