When using PostgreSQL or any SQL database for that matter there are a number of useful commands you can use inside of the PostgreSQL terminal that begin with a backslash and are followed with one or two characters. This post is a non-exhaustive list explaining some of those commands.
List all available databases:
Quit from terminal:
List all available tables in a database:
Run the previously executed command:
List previously executed commands:
List of helpful postgres commands:
List all of the schemas of a database:
List all functions:
List all of the tables views:
Love databases more than your dog loves cheese? You might want to check out this post on pg_ctl vs psql.