Game Objects are the individual pieces of your campaign. They're the Characters, Creatures, Villains, Items, and even Transportation that populate your various campaign containers. This even includes Locations, Events, and Sessions) . You'll give your Game Object a name, and include a short description, quantity, any related Game Objects. Build the Game Objects here, then use them throughout your campaign.
Have a game object that gets duplicated with small changes through the campaign? Create the game object as a template, then link new game objects to that template. You can keep some fields locked to the original template (and thus make it update at the same time as or make some parts of the new game object unique.