How do I convert USDC to USD?

I'm new to the cryptocurrency world and I'm a bit confused about converting my USDC to USD. Could you please explain the process to me in a simple way? I've heard that it involves some sort of exchange or platform, but I'm not sure which one to choose or how to proceed. Is there a specific step-by-step guide you could recommend? Also, are there any fees or charges involved in the conversion process? I'd appreciate any advice or information you can provide.