Check the goal of the project is realistic or has a potential. Scam Project roadmap usually just list bunch of tash that can be done on one quarter and they just listing specific task to prolong it. Also if the project keeps emphasizing exchange listing, price boost and influencer marketing then this is a clear sign that the project is a red flag.
For starter, Check the code of the project is it’s undergone an audit since most of the scam project don’t have the time to get an audit for their smart contract and just focus on shilling to attract investors.