The Setting, Rules and Notes sections of your campaign are where information about the game can be stored. Each of them works as a 'wiki', similar to wikipedia, and are sometimes referred to as namespaces.

Tips & Tricks

• Storytellers can use the Setting namespace to share info about the world with players, but they don't have to do all the work alone. During the campaign, as players encounter new NPCs, visit new places and find ancient artifacts, they can add their newfound knowledge to the wiki.
• Just discovered that Darth Vader is actually Anakin Skywalker? Simply add an alias!
• The Notes namespace is an excellent location for proposed houserules - once it has been agreed, you can easily move it to the Rules wiki.
• Schemas take a moment to master, but they can make your campaign a -lot- more powerful!
• Remember, all wiki pages can be read by everyone - don't put secret DM information on there!