Welcome to the Wiki
I’ve broken this apart into two forks: the crunch and the fluff.
Crunch are the gritty mechanics, the narrative is abstract . The two are intertwined and inseparable, but since some mechanics get re-used and re-skinned it is handy to be able to reference them as such.
Start with reading the Narrative, since there are crunchy bits buried in there. We only use The Crunch for commonly shared mechanics.
Go here for The Narrative
Go here for The Crunch