To enter distances, you have been shown Absolute, Relative and Polar Co-ordinates. Now you will be shown two more ways to tell AutoCAD where the locate the point you are drawing to.
AutoCAD has many tools to help you as a designer. Some of these you may have already used. The properties command gives you a lot of information about an object you have selected and allows you change most of them. AutoCAD also has some commands used specifically for pulling information from objects.