PostgreSQL is well-supported by its active community. There are more than a dozen mailing lists available, categorized into topics like:PostgreSQL User Groups all over the world, and there is also an active IRC & Slack community.
There are also links to international sites that contain PostgreSQL information in various languages.
People in the PostgreSQL community also contribute to:
|Amit Kapila: Parallel Index Scans In PostgreSQL|
|Joshua Drake: PostgresConf US 2018, Financial Review|
|Achilleas Mantzios: PostgreSQL Audit Logging Best Practices|
|Michael Paquier: TAP tests and external modules|
|Ozgun Erdogan: Citus 7.4: Move fast and reduce technical debt|
|Dimitri Fontaine: PostgreSQL Data Types|
|Hans-Juergen Schoenig: CREATE VIEW vs. ALTER TABLE in PostgreSQL|