Thanks @wisemx for your visit and your comment. I made this article to discuss just the master pages design, and not everything about Master Pages. It's a very huge thing that I can never cover up in such a short post :)

I agree with you @mdopp, I had to do everything myself in the web.config, and had to remember everything, and that teached me a lot about web.config and XML structure.
On the other hand, I bet that whenever you want to add anything in web.config, you just google it out to remember where to put everything, and really having to do that all the time is not that easy, and consumes a lot of time. In Visual Studio 2003, there is no intellisence for web.config, and the intellisence in VS 2005 and 2008 aren't that good. I searched for this tool a long time ago but didnt find it, and finally got it! I strongly agree with @tdavisjr that this tool must have been integrated in Visual Studio, or at least a nice and effective intellisence would have done everything!
Anyway, thank you very much for your visit and your comment :) ;)

and thanks everybody for your comments :)

Thank you @deezin for your visit :)