Each note you are taking has context. Simply add that context while entering the new note with the powerfull #tags and @persons annotations, which helps you filtering, later.
Sitting in your weekly meeting or discussing the next birthday party with your wife, you won't type "#weekly" or "#birthday" at any new note!
Simply use Auto-Tags and enter the current context once. Each new note will automatically get that annotations.
Set a type for entries to have a better overview and filter easier.
Pro Tipp: Add a "?" for a question and a "!" for decissions at the end of your entry and KIM will automatically set the type.