- http://www.postgresqltutorial.com/install-postgresql/
- http://www.postgresqltutorial.com/load-postgresql-sample-database/
- W3 Schools - generally my preference, includes manipulation in beginner track
- SQLZoo - better intermediate content, uses deprecated JOINs
- Codecademy - requires sign up, includes manipulation in beginner track
- Daily Challenges - https://www.sqlprep.com/sc_dailychallenge/daily-challenge-8/ (#1-102)
- potential resource for prompts for advanced queries