The above two drawings are AutoCAD single view drawings.These are the first CAD drawings that you will perform in this class.These are the most basic view a drawing can have,considering it is just a single view of a 2D object.
The two drawings above are isometric views with dimensioning.Isometric views allow us to see the top,front,and ride side view of an object,and lay out the dimensions needed to contruct the drawing.These are the second type of drawings that you perform in AutoCAD.
The final two drawing are AutoCAD isometric drawings.The whole point of an isometric drawing is to provide a 3D-esc view of the object drawn.All isometric drawings have to have a thickness to make it 3D like.