add rest of structure

Author: pwseg

src/unify/unify-event-filtering.md

@@ -38,4 +38,8 @@ Keep the following in mind as you work with Unify Event Filtering:
 - Matching is inclusive: if an event matches any filter, Segment drops it.
 - Filtering happens **before** identity resolution; dropped events never reach the profile graph and won’t affect trait updates or [computed traits](/docs/unify/traits/computed-traits/).
 
-As a result, Unify Event Filtering helps you keep profile data clean from the start, without having to preprocess or transform events outside of Segment.
+As a result, Unify Event Filtering helps you keep profile data clean from the start, without having to preprocess or transform events outside of Segment.
+
+## Creating and managing filters
+
+## Best practices