How do I withdraw money from my Bitcoin to my bank account?

Excuse me, could you please clarify the process for withdrawing funds from my Bitcoin wallet to my bank account? I'm a bit confused about the steps involved and I'm hoping you could guide me through it. Specifically, I'm wondering if I need to convert my Bitcoin to a fiat currency first, and if so, what platform or exchange should I use? Additionally, what are the fees associated with this process, and how long does it typically take for the funds to reach my bank account? Thank you for your help.