How do I withdraw Bitcoin from USA?

Hello there, I'm curious about withdrawing Bitcoin from the USA. Could you please elaborate on the process for someone who might be new to cryptocurrency? Are there any specific platforms or exchanges that are recommended for this purpose? Additionally, what are the fees and timelines typically involved in withdrawing Bitcoin from the US? Also, is there any security measures I should take into consideration while performing such a transaction? I'd greatly appreciate your insights on this matter.