Besides the documentation, that is, this book, there are other
resources about PostgreSQL:
Wiki
The PostgreSQLwiki contains the project's FAQ
(Frequently Asked Questions) list, TODO list, and
detailed information about many more topics.
Web Site
The PostgreSQLweb site
carries details on the latest release and other
information to make your work or play with
PostgreSQL more productive.
Mailing Lists
The mailing lists are a good place to have your questions
answered, to share experiences with other users, and to contact
the developers. Consult the PostgreSQL web site
for details.
Yourself!
PostgreSQL is an open-source project.
As such, it depends on the user community for ongoing support.
As you begin to use PostgreSQL, you
will rely on others for help, either through the documentation
or through the mailing lists. Consider contributing your
knowledge back. Read the mailing lists and answer questions. If
you learn something which is not in the documentation, write it
up and contribute it. If you add features to the code,
contribute them.