i just know some scammer selling the illegal GC card. and leave the victim a mass.
who will tell me how to prevent it.
or would anyone rank the risk of the GC type or the trading place?
1.Use trusted "middle men" (escrows).
2.Use websites with a review system,where people leave positive or negative feedback after they trade,like
localbitcoins.com or this forum.Trade with people who have lots of positive feedaback.
Gain some experience and learn how to trade.
Good luck OP.