Sometimes you can be lured by sweet words and might fall into others trap. As a newbie here you are motivated to try trading for the first time and then decided to buy and sell to earn a little profit. Check on those cheap decentralized exchange and then buy the coin you want to buy and sell, and the suddenly you cant sell it on legitimate exchange. The last thing you know is, its a wrong coin but with the same name but with different contract address.
That's why we need to be careful in buying and selling our coins in different exchange. Much better to trade on the exchange that already known. And always check the coins and contract address if it is right and legitimate.
It's easy to trade coins now but I advise investors to choose reputable and well-known exchanges because it will help reduce the risk of property losses for investors. I think investors should spend time choosing the right Exchange for themselves to be able to trade safely.