Before you start using a CNC machine you need to understand the flow of the model development and machining process. This video provides a somewhat brief overview of what the CAD software, CAM software and GCode each due in the process of machining your part/piece/etc.
Boring, not useful.
Just knowing how to turn the CNC on will rarely get your part cut. Thus understanding the process from start to finish will help, hopefully :-).

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More by rmcinally:Using a CNC to reduce your workload with non-cnc projects Understanding the machining process from draw to CNC 
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