Reading the Fine Manual (RTFM)

RTFM is often used rudely, meaning "don't bother me, I'm busy", or is used as a stronger form of abuse. The strange thing is that asking you to read the manual is most often very good advice. Don't flame them back, take the advice. The most important point to remember is that you should refer to a manual whose release version matches the server on which you are operating

The PostgreSQL manual is very well written, and is comprehensive in its coverage of specific topics. One of its main failings is that the "documents" aren't organized in a way that helps somebody who is trying to learn PostgreSQL. They are organized from the perspective of people checking specific technical points, so that they can decide whether their difficulty is user error or not. It sometimes answers "What?", but seldom "Why?", or 'How?"

I've helped write sections of the PostgreSQL documents as well, so I'm not embarrassed to steer you towards reading them. There are still many things to read here that are useful.