The document discusses common 2D and 3D CAD commands. In 2D CAD, commands allow users to draw grids, shapes, layers, and perform actions like zooming, copying, rotating, scaling, and mirroring objects. 3D CAD allows creating wireframe, surface rendered, and photorealistic models and performing operations like combining, subtracting, and adding shapes. Key benefits of 3D CAD include producing realistic designs and orthographic views quickly without needing physical models.