We love sharing our PostgreSQL knowledge for free as well. Have a look at some of our PostgreSQL video tutorials to get you prepped for your next Postgresqlcourse.com class.
Installing newer versions of PostgreSQL on RedHat/CentOS
Debug PostgreSQL startup problems
Logical Replication with PostgreSQL 10
Dump query results from PostgreSQL to file
Upgrade PostgreSQL 9.4.x to 9.5
Logging into PostgreSQL without password
For more free video tutorials, visit our YouTube Channel