How do you find out if you are talking to a scammer?

How do you, as a cryptocurrency and finance practitioner, go about identifying whether you're communicating with a scammer? Are there any telltale signs or red flags that you look out for in conversations or transactions? Given the prevalence of scams in the cryptocurrency world, it's crucial to stay vigilant and protect oneself from potential fraud. What advice would you offer to individuals looking to safeguard themselves against such scams?