I just saw this somewhere on the internet. Are there any fake coins existing? How do you avoid buying fake coins?
Definitely there are fake coins. These most time happen to tokens using the ethereum platform. There might be an original token and some scammers would create theirs in order to deceive novice into buying from them.
Which ever coin you want to buy, check if it is listed on coinmarketcap and get the exchanges on which it is listed.
If you want to buy such coin on exchange while not listed on CMC, you can check the contract address and compare with that of the project team.