What is the easiest way to sell books?

So let me see if I can make this simple. Let’s say you write a novel. When you do, as it’s creator, you own the “copyright,” the right to print the work and sell copies of it. Under US law, you don’t need to necessarily register that copyright, but it is helpful if you do. (Registering copyright isn’t hard. Just Google the topic. I saw a scammer last week telling authors it was a complex process and he wanted $80 to do something that would actually take the author only a couple of minutes.)