editing new units

They should add a crusade option or add a Templar’s faction where you have to prove yourself worthy of god and not commit any sins. When your a Templar you can only use Templar brother knights or Templar recruits. You’ll have to worry about each solder because you’ll have a limited amount of...

Is there an tutorials or breakdown how to make custom units and unit upgrade trees? No need to be super detailed I'm fine with just some simple stuff. I'm having trouble just finding the base game files for the unit trees to learn how it all goes together. (Complete modding noob)

Hi, currently i'm trying to add new units to the existing ones/ reworking the existing units. (For now this is just for me to mess around/ learning the basics etc.) But when i create a new unit in the .xml (like adding a new upgrade path to vlandian recruits) the game crashes. what do i need to...