Obvious scam red flags:

- someone asks you to transfer a small amount of any crypto to participate,
- someone asks for your private keys (NEVER give them to ANYONE),
- promising unrealistic returns - if something seems too good to be true, it is,
- asking for any form of ID (driving license, passport, etc.) to participate,
- low quality website & no whitepaper,

That list is by all means not exhaustive, hopefully other users will give additional advice.