Sorojchi,
Nothing is too basic. This is where most of us get our start and get on the path of learning.
Mach is a "controller" software. Controller types of software produce the pulses that drive the CNC machines steppers or servos. It takes G-Code and converts it to movement.
KCAM4 is another "controller" type.
BobCAD/CAM is a drafting (computer aided design) software and a CAM (computer aided manufacturing) software. You draft your ideas in CAD, show the machine what you want and how you want it in CAM and the CAM side produces the G-Code needed for the controller.
Mach 3 also does a great deal of G-Code generation itself. Simple tasks like pocketing, drill cycles, holes, engraving.... are all done conversationaly inside Mach.
I appologize if that was unclear. It is kind of a loaded question. You will find tons of posts throughout this forum on getting you started.
Good luck.
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