I have recently been getting into the Golarion setting after playing for a couple years in homebrew worlds. I have picked up a few of the Campaign Setting books and really enjoy the content but I was wondering if there are any instances of older material being made obsolete by newer releases?
For example, I heard that the old Dragons Revisited isn't the most up-to-date information on the subject. If that's the case, is there a "more correct" book that contains that information? Furthermore, are there any other instances where this occurs? I would like to learn more about the setting while avoiding conflicting (or repeated) content.