How to swap BTC to BTCB?

Could you please explain, in a step-by-step manner, how to successfully swap BTC to BTCB? I'm a bit unfamiliar with the process and would appreciate it if you could outline the key components and any necessary considerations involved in making such a swap. Additionally, are there any fees or charges associated with this conversion? It would be helpful if you could also mention any platforms or exchanges that offer this service and their reliability. Thank you for your assistance in this matter.