How to buy on OKX?

Could you please explain, in detail, the process of purchasing cryptocurrency on OKX? I'm particularly interested in understanding the initial steps, such as creating an account and verifying my identity. Also, could you elaborate on the payment methods available and any associated fees? Additionally, how does the platform ensure the security of transactions and user funds? Lastly, are there any specific tips or recommendations you have for first-time buyers on OKX? Thank you for your assistance in navigating this process.