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:
|Hubert 'depesz' Lubaczewski: Changes on explain.depesz.com|
|pgCMH - Columbus, OH: What’s new in pgBouncer|
|Avinash Kumar: Bloom Indexes in PostgreSQL|
|Luca Ferrari: A recursive CTE to get information about partitions|
|Jeff McCormick: What's New in Crunchy PostgreSQL Operator 4.0|
|Hans-Juergen Schoenig: Tech preview: How PostgreSQL 12 handles prepared plans|
|Luca Ferrari: FizzBuzz (in both plpgsql and SQL)|