How do I buy bitcoin & receive cash?

Sure, here's a possible description in the tone of a questioner, based on the paragraph: "Hey there, I'm new to the world of cryptocurrency and I'm interested in buying bitcoin. But I'm a bit confused about how the whole process works. Can someone explain to me how I can buy Bitcoin and then receive cash for it? I've heard about exchanges and wallets, but I'm not entirely sure how they all fit together. I'd really appreciate any help or guidance on this topic!