Origin story
The center of your game world is called the origin. The origin is the magical place in 3D space where everything begins. 3D space is divided up by X, Y, and Z axes. If you remember your Cartesian grid from grade school, or if you've ever seen a bar or line graph, the X-axis runs one way (usually horizontally), and the Y-axis runs perpendicular to it (usually vertically). 3D is like taking a second piece of paper and sticking it at right angles to your graph so that you have a third axis firing straight up at your face from your desk, and down into the floor in the opposite direction.
The orientation (the way the X, Y, and Z axes are ...
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