Primary Objective: Cripple the colonizing adversaries I will divide the guides into Conquest and Colonization sections and a separate Event section which will be common for both guides. And the other is for a more relaxed play style, which I call Castile ‘n Chill. One is for intense expansionist game play, which I call Colossal Castile.
Just like my Austria guide, I will lay out two guides for different play styles. In short, Castile could be played in a lot of different ways.
You can PU Aragon, Austria or Portugal and get the Burgundian inheritance too. Your home trade node receives a lot of money from the new world, and you can potentially get a lot of merchants, so you can learn about trade and become very rich mid to late game. Your national ideas are only behind Portugal on colonization. You have very high early game army morale, so you can go full conquest Iberian peninsula has natural fortifications on map which will help you out defensively. I find it very enjoyable as there are a lot of different aspects of game you can play through. Castile is one of the most played nations by newer players.