I want to do carving in the optical factory. What kind of CAD knowledge should I learn?

You mean laser marking in an optical factory!

It is not very demanding to do CAD in glasses factory, as long as you can use it (basically no CAD is needed, mainly carving). It seems that I will also know Coreldarw software, which is also used for carving and changing drawings. )

If you want to design glasses model in glasses factory, you must master 2D and 3D CAD. CAD is widely used, but as long as you learn the basics of CAD well, you can get started quickly in all aspects.