What are the best ghostwriting websites?

Ghostwriting is a very common practice in current years as people have much need for professional writers in every niche and career. And writers get good opportunities to make a good sum of money by writing for others. There are many affordable book and novel ghostwriting services where professional writers get hired as ghostwriters and write for the customers based on their requirements to deliver well-written copies for books, novels, e-books, autobiographies, memoirs, etc.