Now you know a few things about the PostgreSQL environment, as well as some things that will help you in the unforeseeable future. PostgreSQL is built to handle your needs, but more importantly, it is built not to change underneath you in the future.
We touched a little on the environment and called out some of the more important things to keep in mind while programming on the server in PostgreSQL. Don't worry too much if you don't remember all of it. It is fine to go on to the next chapter, where we actually start making some useful functions. Then come back and review this chapter when you have a clearer understanding of the features available to the function writer.