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@kcol-kkc Here is the very basic idea, everything UCS operations build off of this...
Wherever you UCS is located is always 0,0,0 coordinate (X,Y,Z coordinates) in 3d space.
2D objects are drawn in 2d space, which is normally XY plane.
You can Move your UCS anywhere in 3D space
You can also Manipulate your UCS on either X,Y,Z axis' (flipping it around without actually moving it)
I draw a 3D cube in space (this cube will never move for explanation purposes).
When you draw a 2d circle on a corner of this cube, the 2d circle will appear on the XY plane which your UCS is set.
If you manipulate the UCS, while leaving it at the same location, draw a 2D circle again and see how it appears now. It again appears on the XY plane, but now 3d rotated cause you manipulated your UCS.
Same thing here, 3 options exists for a 2d circle to be inserted in 3D space by simply manipulating your UCS.
You can also Move your UCS anywhere you want... And the location will always be 0,0,0.
Start by practicing moving and manipulating your UCS in 3d space such as this example. The command for that is UCS. Use the ID command to see how the drawing coordinates move around when you move or manipulate your UCS.... Once you are confortable with that concept, everything else UCS related will fall into place w more practice.