www.cprogramming.com

go there and theres a tutorial section on c++ that will get you started.

when the projects grows bigger and bigger , you will face the difficulty of finding
a new name for new identifiers without altering their meaning or you will
end up with long names like 'paser_sub_componment_xml_get_input'.

so that's where you can use namespaces. For a example namespace std refers to the standard library.
I think you should read the a C++ book and do examples. I suggest you to download knoppix like linux distribution and do the particles of that book.
Here is the best book for a beginner that I found, and the good news is it's free.
http://www.mindview.net/Books/TICPP/...tml#HTMLFormat

or read it online here ,
http://www.codeguru.com/cpp/tic/tic_c.shtml

you can do a lot if you can download and burn a knoppix CD , it contains the everything that you need. the compilers assemblers IDE's and editors.

and for you're question on namespaces you can read http://www.codeguru.com/cpp/tic/tic0110.shtml directly , but recommand thing is start from the chapter 1.

Or read the following (IMO the best) free e-book about C++ programming: http://msdn.microsoft.com/en-us/beginner/cc305129.aspx

How unfair! I bought that book once, I never knew it was on msdn.

Don't worry, buy yet another book!