Green girl with red holes . If you really want to excel in this field then read as much as you can about bitcoins and even programming related to it . To stay away from frauds never sell without escrow and don't have transactions with reversible payment systems .
yeah, i think the reversible payment system plus scammer is totally a disaster.
would you please take some example for that kind of system?
by now ,i just know the amazon GC is reversible,how about the Walmart GC , and other transfer method?