Sometimes it is difficult to distinguish the right coin with a fake coin or scam. The best way to avoid it is to seek as much information about certain coins. Then see if many people buy the coin, and look at the background of the coin.
Sometimes even if you already do that we are still stuck with fake coins, maybe the best and safest is to buy the right coins are guaranteed like ETH, Litecoin, Ripple and others who are in coinmarketcap.