Just Started

I started a few days ago with OpenGL, maybe I am stupid or missed something, I followed the instructions in “Getting Started”

But when I just test the following code
//Some header file.
include <GL/gl.h>
include <GL/glext.h>
include <GL/wglext.h>

extern PFNGLACTIVETEXTUREPROC glActiveTexture;

and run it I get 143 errors from GL.h
(I am using Visual Studio 2008 C++)

Read OpenGL manuals…
Learn Example codes from this link, http://www.opengl.org/code/

Some information can take time to track down in the Wiki, but here you go
http://www.opengl.org/wiki/Platform_specifics:_Windows