What is a red flag for a scammer?

So, let's talk about red flags for scammers in the world of cryptocurrency and finance. Can you tell me, what are some common signs that should make us wary of a potential scam? Is it the promise of unrealistic returns on investments? Or perhaps the use of high-pressure sales tactics to get you to invest quickly? How can we spot these scams before it's too late and protect ourselves from financial loss?