What is kucoin and how to use it?

Could you please elaborate on the cryptocurrency exchange Kucoin and provide a step-by-step guide on how to utilize it effectively? As a crypto enthusiast, I'm curious about this platform's unique offerings and features. I'm particularly interested in understanding its trading mechanisms, supported cryptocurrencies, security measures, and any special incentives or promotions it might offer. Additionally, I'd like to know if it's suitable for both beginners and experienced traders and any advice you have for getting started on Kucoin. Thank you for your assistance in clarifying this exciting cryptocurrency exchange.