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GUI Basics

So every game has some type GUI (graphic user interface). The best way (as I see it) is scripting the GUI.
Very simple, so something easy to start with:

function OnGUI(){
GUI.Box(Rect(10, 10, 90, 90), "Hello!");
}

Rect - Shape the box will be, rectangle.

(10, 10, 80, 90)
10 - How far away it begins from the left of the screen.
10 - How far away it begins from the top of the screen.
80 - Total width of rectangle.
90 - Total height of rectangle.

"Hello!" - Text that shows up in the box.

The OnGUI function is updated every frame, just like the update function. Now as long as the script containing this is attached to a game object in the Hierarchy, the GUI will display (Make sure you don't name the script GUI).

Making a GUI button...

if (GUI.Button (Rect (20,40,80,20), "Menu")) {
Application.LoadLevel (1);
}

Making a GUI Icon:

var icon : Texture2D;

function OnGUI () {
GUI.Label (Rect (0,0,100,50), icon);
}

Making a GUI have an icon and text:

var icon : Texture2D;

function OnGUI () { 
GUI.Box (Rect (10,10,100,50), GUIContent("This is text", icon)); 
}

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