As the title suggests, a 2-dimensional space is flat , like the surface of the blackboard, or like the floor in this room. The simplest is a line, or part of a line. There a point can be located by exactly one coordinate. An example of a 0-dimensional space is a single point. In that space there is nowhere to go, and it takes no numbers to tell where you are.
Geometric shapes are the simplest objects that can exist in space.
In our 0-dimensional space the only object is the point itself. In dimension 2 we have various choices. Suppose we tried to extend the two patterns of relations. Try to extrapolate the patterns yourselves. We can't, of course, not in three-dimensional space.