To work in 3D, you will need to have a basic understanding of space. In 3D, you will work with 3 axes. The X axis is your Width/ Length axis. Your Y axis is your height axis, and your Z axis is your Depth axis. These three axes pertain to the 3 Dimensions of Length, Height, and Depth. When you work in 3D, you will be creating curves and surfaces that flow between these axes to create 3D objects. To get a better understanding, see the graphics below.