[Help] 2 Questions...

Okay first off I'm learning to code right now with learncpp.com and it's going kinda well right now. I'm learning a few stuff but I, of course, still have some questions that the tutorial or guide or whatever doesn't tell me.

First question: What is the function of DoPrint()? It is at 1.4 — A first look at functions Learn C++
(Hopefully this wont be advertising even though it kind of is an outside link ...) Is it important? Like... Should I know what it does?

2nd question: I'm using Visual C++ 2010 right now. Is there another complier that's better? (if it isn't a compiler then ma bad :P) Or does that not matter either? lol

Last question:
If I use using namespace std; in something like that code, do I have to put std::cout / std::endl?
Thanks in advance!

Also, one more question. (Hopefully this will go into the main thread i cannot edit it because my school laptop is retarded...)
Does anyone have a better guide to learning C++ than this? Cuz if you do then I would like to start that one before I get too far into this one.

Also another one more question lol. In learncpp.com it says to use win32 console application or something like that. Should I use something else? Because I remember someone saying that I should use a different one or just open a new project a different way.