Me first, I would check:
1. team background
2. website
3. whitepaper
4. quality of community
What about you?
1.CLAIMS OF HIGH, GUARANTEED RETURNS.
2.CELEBRITY ENDORSEMENTS
3.CLAIMS OF “SEC-COMPLIANT” (guarantees that their coins will trade on an SEC-compliant exchange where you can buy and sell them for profit)
4. INVESTING WITH A CREDIT CARD.
5. PUMP AND DUMP SCAMS.(Tempting you with guaranteed gains with pumps and dumps during pre ico to crowd sale)
6.Team members without any social profile. if they provide be sure to check the genuinity on basis of followers and background.
7.Language( grammar is correct or not)
and if you have done these be sure to read the whitepaper!!