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:
|Bruce Momjian: Windows and Shared Buffers|
|Sebastian Insausti: PostgreSQL on the Rise: 2018 Postgres Findings & 2019 Trends|
|Michael Paquier: Postgres 12 highlight - Controlling SSL protocol|
|Will Leinweber: \watch ing Star Wars in Postgres|
|Bruce Momjian: Micro-Optimizations|
|Bruce Momjian: Optimizer Hints|
|Luca Ferrari: PostgreSQL 11 Server Side Programming - Now Available!|