Concepts
Important AutoCAD Concepts
Learn the terminology used in AutoCAD. Become an expert when talking about AutoCAD to your clients and coworkers.
Three Methods to Select AutoCAD Objects: Window, Crossing, Direct Selection. Learn which is the best method to use every time you select objects.
In AutoCAD, the World Coordinate System (WCS) is the default coordinate system. The coordinate system is called the User Coordinate System (UCS) if it is changed from its default location.