Also note that RedHat does PostgreSQL training:
https://www.redhat.com/training/developer/courses/rdb147.html
Note, however, that this is "RedHat Database" training. "RedHat Database"
was a rebranded PostgreSQL 7.3.4 introduced back around 2004; so I'm not
sure if this training would include anything that is "Postgres Generic"
or any features introduced after 7.3.4.
Cheers,
-J