A simple example of how CAD can draw a three dimensional drawing is a bedside table

Hello, you can draw with the physical tool.

Or are you talking about how to draw some line patterns that look three-dimensional, but don't generate entities?

If you are asking this, it is not clear in a few words, then you have to read "Mechanical Drawing", which has a special introduction, that kind of diagram is called axonometric drawing.

Understand the concept of the UCS coordinate system. The conversion of UCS coordinates is equivalent to the reference conversion between datum planes such as front, right, and top in 3D software. Note that in CAD, whether it is stretching, rotating or sweeping, the defined lines must be closed, so the polyline "PL" command is usually used, of course, you can also use the line command, and finally the "PE" command is used to composite.

Defining blocks is also an approach.