Windows API in C/C++

Help, I have no idea how to correctly use the API to create windows and fill them with text and shit.

Give me information, tutorials, etc.

>>61
hello.cs(1,7): error CS0234: The type or namespace name `Windows' does not exist in the namespace `System'. Are you missing an assembly reference?
hello.cs(1,1): error CS0246: The type or namespace name `System.Windows' could not be found. Are you missing a using directive or an assembly reference?
Compilation failed: 2 error(s), 0 warnings