One of the most common scam is the Ponzi Scheme. I'm pretty sure most, if not all of us are very familiar with this scam. In a Ponzi Scheme, the scammer promises high returns on investment without doing any actual trading. Instead, the scammer gains new participants mostly true referrals and uses their funds to pay the earlier investors' promised profits. The Ponzi Scheme collapses when new participants dwindle or demand a payout, and the scammer disappears with the remaining funds. There's something my dad always tells me, " there is no such thing as something from nothing". Anyone that promises you a particular amount of BTC, and all you have to do is invest a particular amount or share their link to invite a given amount of people, that person is a scammer, and potential investors should avoid them at all cost.
The Ponzi scheme has been the type of scam that newbies and inexperienced people usually fall for the promises those Ponzi organizers offers are mouth watering and made up. I have some topics on some of the various Ponzi schemes.
https://bitcointalk.org/index.php?topic=5245895.msg54363375#msg54363375https://bitcointalk.org/index.php?topic=5257989.msg54680733#msg54680733The biggest turn off I have is that there are newbies that had fallen victim on previous Ponzi schemes but still persist and joins more Ponzi schemes in the hopes of having a payday someday. Always learn to accept your loss and make your corrections.
Another fraud is the Phishing scam, where a scammer creates a fake website that pretends to be a popular cryptocurrency exchange or wallet. They ask for login credentials, private keys, and then proceeds to access the victim's cryptocurrency wallet and steal their funds.
Falling for this sort of scam goes beyond your actual knowledge of Crypto-currency it can also be prevented by reducing your risk which is becoming hard, you can also be a victim for such scams through ads, malware and generally having the device of your wallet online keeps you prone to such scams, you can use cold storage to protect yourself.
Read more about cold storage here.
https://electrum.readthedocs.io/en/latest/coldstorage.html