What are the most popular derivatives?

Could you elaborate on what you mean by "the most popular derivatives" in the context of cryptocurrency and finance? Are you referring to derivatives that are commonly traded or have the highest market capitalization? Are you also interested in understanding the mechanics behind these derivatives, such as how they are structured and what risks they pose to investors? Additionally, could you provide any specific examples of derivatives that you're particularly interested in learning about? Understanding these details will help me provide a more accurate and informative answer to your question.