This page serves as a compilation of useful information from the PostgreSQL community, including blogs, wikis, and websites. The goal is to organize and summarize the articles and provide links for further reading. The page covers topics such as the PostgreSQL architecture, compatibility between client and server versions, logical and physical database structures, database object hierarchy, physical storage, query processing, and troubleshooting connectivity and connection termination issues. One interesting aspect is that PostgreSQL does not exclusively perform writes by a specific background process, unlike other DBMSs.
https://wiki.postgresql.org/wiki/Operations_cheat_sheet