There is sort-of an in game encyclopedia (check the reference tab in the statistics screen), but it isn't exactly tailored to exploring and learning about the game. It's more tuned to the use case of looking up an exact detail, and you know what detail it is you are looking for (not the value of that detail, but rather, what knowing mechanic or stat it is you are interested in). Certainly can still be useful, but it would be cool if it had an "alternate" view more tailored to helping one learn the game, in addition to the current "lookup chart" view.