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Here are a few important techniques to use when you draw objects:

 Use precision tools to make sure objects intersect precisely and are drawn at the correct angle. Precision tools allow you to reference points on existing objects, constrain the cursor to a specific angle or snap distance, and quickly locate a point based on a distance and direction in which the cursor is moved. I cover precision techniques and tools in ssss1.

 Understand the difference between command line and Dynamic Input coordinate entry. Second and next points entered at the command line are interpreted differently from those entered at the Dynamic Input tooltip. The second and next points entered at the Dynamic Input tooltip are formatted as polar and are relative to the previously entered coordinate value automatically, unlike at the command line where you must first type @ before the coordinate value for relative coordinates. AutoCAD’s Dynamic Input system displays a lot of the information at the cursor that you used to have to look down to the command line to see. To use Dynamic Input, press F12 to toggle it on and off.