What are crypto trading captions?

Could you please elaborate on what crypto trading captions are? Are they simply captions that accompany posts related to cryptocurrency trading, or do they have a more specific function or purpose within the context of cryptocurrency trading? Are there any guidelines or best practices for creating effective crypto trading captions that can help traders engage with their audience and promote their trading strategies? I'm interested in learning more about this topic and how it relates to the world of cryptocurrency trading.