I like the idea of such a guide, but the resources currently there can be picked up by someone in less than a day of using postgres. It is a good start however as it covers the basics well except for installation/setup. I think that section needs to include setting up postgres database data in a different partition than the one where the DB itself is installed as well as setting up clusters.

Also it lacks certain information that is really helpful particularly when dealing with Postgres. An example is this: http://blog.jonanin.com/2013/11/20/postgresql-char-varchar/

The harder things that I've had trouble with are not covered. They include escaping JSON correctly when dumping the database to CSV, stored procedures, setting up a cluster, automated backups, fallover DBs and recovering from a crash with minimal downtime.