What will a scammer ask from you?

Excuse me, could you please tell me more about what a scammer might ask from me when dealing with cryptocurrency? I've heard horror stories about people losing their investments, and I want to make sure I'm not vulnerable to such scams. Specifically, are there any common requests or phrases that should set off alarm bells for me? I'd really appreciate your insights on how to protect myself in this ever-evolving landscape of digital finance.