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Expertman, In early Electronics, ask about anything that you feel uncertain about. Its a "grey" area, an important question. In response, "Ground" and "Negative" are used with the same intent.They refer to the "polarity" of the power supply(Battery in this case) and where the 'pin' of a component's intended destination is(These components are usually labeled with this, if necessary) if unsure, find it online-(Not in a 'Blog', use 'DIGIKEY') Great prices, too!. Good luck, hope this helped!