How do I transfer money from my crypto wallet to my bank account?

Could you please explain the process of transferring funds from my cryptocurrency wallet to my bank account? I'm not quite familiar with the steps involved. Could you guide me through the necessary actions? Is there a specific platform or service that I need to use? Do I need to convert my crypto assets to fiat currency first? What about the fees involved in this transaction? And finally, how long does it typically take for the funds to appear in my bank account? Thank you for your assistance in clarifying this matter.