You can find most common scam methods used by scammers in Cryptocurrency scambook. More helpful, it has advice to do for avoiding scams as well.

Collection of comprehensive guides on identify and avoid scam projects
5 Tips on How to Avoid Crypto Scams.
The Complete Guide to Bitcoin Scams and How to Avoid Them.

To wrap up, if you are not greed, you have less chance to fall in scam. If you are careful, you reduce risk to be scam. Combine them, don't be greed but be always careful, you reduce scams like 90% or 99% less likely.