Why should home improvement combine CAD and 3D? How should I learn? I am a self-taught expert, pointing out the maze.

First, in drawing, cad may be used when making 3d renderings. Some models are made of cad graphics, but this is not necessarily the case. The master can make 3d models without cad graphics. But for most people, cad is still the basis of modeling. When building the primary model of home decoration, cad and 3d have a little intersection, and it has nothing to do at other times.

Second, from the basic point of view, cad should be the construction drawing of painting. I want to do a good job in 3d renderings, but I can't read the construction drawings. If you don't even know what shape something is on which side, how can you make an renderings?

Thirdly, I suggest you learn cad well before learning 3d, because cad is much simpler than 3d, and it is also the basis of computer-aided design. When you finish learning cad and then learn 3d, the above will not be a problem for you, and you will feel that you have crossed the bridge when you get there.