How to make animation in C# (OpenGL/OpenTK)?

Question

OpenGL

Today I literally started learning OpenGl in C#. And I ran into a number of questions, some of which I will list:
1) Let's say I created a window

public static void Main()
        {
            GameWindow win = new GameWindow(800, 600);
            win.Run(1.0 / 60.0);
        }

And how to display the same Hello World on it?
2) If so, how to make a primitive animation (For example: Cyclic animation. Tobizh displays the same Hello World. A second later, another message is in its place (In other words, a frame change).
3) Throw literature on OpenGl (preferably under C #)
UPD: And how to change the title, instead of OpenTk game window - to your own?