AutoCAD 2d is primarily used to create 2d drawings, it's used across industries such as civil, architectural, electrical, mechanical, automobile, aeronautical etc. You can draft and edit 2d drawings, create isometric views in Autocad 2d. autocad3d is used to create non parametric 3d models (prototypes). You can learn more about 2D & 3D Modeling in AutoCAD. This course offer you by SourceCAD Youtube Channel.
If you are not familiar with AutoCAD basics you have to follow this course first.
