How to buy OKB on Binance?

Could you kindly explain to me the process of purchasing OKB on the Binance platform? I'm new to this, so it would be helpful if you could provide step-by-step instructions. What are the prerequisites? Do I need to have a Binance account already? Also, how do I ensure the safety of my transactions? Are there any fees involved? Additionally, could you tell me about the OKB token and its potential? Thank you for your assistance.