AutoCAD is popular software used by construction professionals to create plans. AutoCAD runs on a series of commands that allow you to place vector drawings in coordinates for accurate rendering of building plans. When learning AutoCAD, start by learning to recognize and use some of the basic commands and valuable tools, which will help you create accurate drawings in AutoCAD. Understand and familiarize yourself with the type of drawing engine that runs CAD. AutoCAD drawings are vector drawings, so it is helpful to become familiar with the look and nature of vector drawings. Use the drawing tools in AutoCAD to construct objects out of lines, circles or combinations of lines called polylines. After you use the tools in the ‘Draw’ menu to construct lines, circles, and shapes, play with the placements of your lines and shapes. You will notice that AutoCAD is different from drawing programs in which your main drawing tool is a pencil or a pen you control with your mouse. Use the modifying tools change your object. To do this, access the tools in the ‘Modify’ menu on the toolbar. Modifying tools are an important component of AutoCAD. Practice modifying your object in many ways, the most basic commands will modify an object by moving it, by changing its size, or by copying it, rotating it, by creating a mirror image or by turning the object. Become familiar with the use of layers in AutoCAD. The layers menu can be accessed through the ‘Settings’ menu in the toolbar. From the ‘Settings’ menu, choose ‘Layer Control.’ Layers are an important tool in AutoCAD. A layer is an electronic equivalent of ‘tracing overlays on a drawing board,’ according to the AutoCAD tutorial at cadtutor.net. Practice using layers to ‘control the visibility, colour and linetype’ of each individual layer. If you require guides to help you accurately construct your drawing, try creating a layer that serves as a guide which can be deleted or hidden before it goes to print. Note that layers cannot be used to control where an object is in three-dimensional space. To practice object selection, first draw a few objects in the drawing field. Select an individual object by navigating your cursor over the object and clicking the object you wish to select. Next, try selecting multiple objects. To select multiple objects, practice using the windowing or fence selection to choose your objects. Both windowing and fence selection allows you to select multiple objects for modification, while leaving other objects unselected. Practice using the OSnap function to help you create accurate drawings. It also helps you connect lines easily. OSnap is automatically on by default in AutoCAD. Observe the cursor as it snaps to the center of an object. Osnaps help you find exact locations, like the end of a line or the exact center of a circle, by selecting the Osnap and selecting in the vicinity of that location. Osnaps are much more accurate than selecting freehand, so they are the best choice if you need a precise drawing. Osnaps are available on the standard toolbar and also have their own Osnap toolbar. Source.