reword docs

docs/docs/getting-started/1-create-your-aggregate-root.md

@@ -3,9 +3,12 @@ permalink: /docs/getting-started/create-aggregate-root/
 title: Create an Aggregate Root
 ---
 
-Our first step is to create an event-sourced aggregate root. This is the software model
-we'll create that internally uses events. The aggregate root has functionality to rebuild
-itself from stored events. It also has functionality to record and expose new events.
+Our first step is to create an event-sourced aggregate root. This is the domain model
+we'll create that internally uses events. An aggregate root constructs itself from a
+series of historical events. Inset of mutating properties directly, it uses events to
+capture what is happening.
+
+Simplified, you can say that a `historical events => model` and `model + action = new events`.
 
 EventSauce represents an aggregate root internally as an interface. Your model will be an
 implementation of that interface. To make it easy, a default implementation is supplied in