For further documentation on using PostreSQL please refer to the official documentation on:
https://www.postgresql.org/docs/
For PostgreSQL support, refer to their support section:
https://www.postgresql.org/support/
For pgAdmin documentation refer to the following:
https://www.pgadmin.org/docs/
Disclaimer: PostgreSQL is a registered trademark of PostgreSQL Global Development Group, Inc. and is licensed under PostgreSQL License. No warrantee of any kind, express or implied, is included with this software. Use at your risk, responsibility for damages (if any) to anyone resulting from the use of this software rest entirely with the user. The author is not responsible for any damage that its use could cause.