How do I Cash my crypto?

As a cryptocurrency holder, I'm often faced with the question of how to convert my digital assets into fiat currency. Could you provide a step-by-step guide on the process of cashing out crypto? I'm particularly interested in understanding the various options available, such as using a cryptocurrency exchange, peer-to-peer platforms, or ATMs. Additionally, I'd like to know about any security considerations or tax implications I should be aware of during the process. Please provide a comprehensive overview, considering both ease of use and efficiency.