AutoCAD Tutorial - 01. This AutoCAD Tutorial is a basic beginner tutorial. AutoCAD commands covered in this tutorial are Limits, Zoom All, Line, F8 (Ortho Mode), Erase, Osnap (Object Snaps), Circle, Undo & Redo. As the Line is first and important draw command, it has been shown in detail. How to draw straight lines & lines is specified angle has been shown. Line options such as Undo & Close are also covered. Both Manual & Automatic Osnap methods has been show. Circle creation method has been shown with radius option.