In the sidebar sections there are caches of hard fought lore for our doughty adventurers. Stories, rumours, perhaps tales of exploits and daring?
Greyhawk itself is a great sprawling world filled with the tensions of warring kingdoms and powers. A useful primer on all things Greyhawk can be found here.
The Great Library of Greyhawk holds great knowledge and lore. Much of it has been captured here: https://greyhawkonline.com/greyhawkwiki/Main_Page