In this chapter, you have learned about the most important features of PostgreSQL replication, such as streaming replication and replication conflicts. You have learned about PITR as well as replication slots. Note that a book on replication is never complete unless it spans around 400 pages or so, but you have learned the most important things every administrator should know.
Chapter 11, Deciding on Useful Extensions, will be about useful extensions to PostgreSQL. You will learn about extensions that have been widely adopted by the industry and that provide even more functionality.