How do I withdraw money from Bitcoin to USD?

Could you please explain the process of converting Bitcoin into US dollars and withdrawing that money? I'm interested in knowing the steps I need to take to cash out my Bitcoin holdings. What are the platforms or services I can use for this purpose? Are there any fees or commissions involved in the process? Also, how long does it typically take to complete the withdrawal? I'd appreciate any information you can provide to help me understand the process better.