Gameplay : Principles of the tab
In the articles, the Gameplay tab contains technical information on the subject: features of the creatures, locations, behaviour, etc. This isn’t information available to the characters, but only precision to grasp the game through its operating.
Hence, it is related to most of the OOC information that allow the player to understand how the world functions.
If you don’t want to spoil the mystery of the world on this subject, you’re strongly advised not to read it! There’s a lot more fun in testing in game and discovering gradually how the world words. But, if in doubt, the data available here should allow you to solve it.