Visit the three sections (C, C++ and C#) to find instructions on getting started with each language, how to download and install compilers, and start working through the tutorials.
Interested in C? A lightweight language, useful for non Visual apps (i.e. system tools and utilities).
Interested in C#? - also known as C Sharp. The most modern of the three languages, available only on .Net. Nearly as powerful as C++.
Whichever you choose you'll find all you need here.