Can you exchange bitcoins with dollars?

Could you elaborate on the process of exchanging bitcoins for dollars? I'm interested in understanding the mechanics of such a transaction. Is it a straightforward process? Are there any specific platforms or exchanges that facilitate this kind of trade? What are the fees involved, and how long does it typically take for the transaction to be completed? Also, is there any risk associated with converting bitcoins to dollars, and how can one mitigate those risks? I'd appreciate a detailed explanation of the entire process.