To manage your personal information, the familiar four PIM (Personal Information Manager) are Calendar, Contacts, Reminders, and Notes.
You know an appointment goes into Calendar. Contact info should be in Contacts. To-do items in Reminders (or maybe Things). Any others, in Notes?
But what about all those pieces of data that is not an event, not a contact, not a to-do, yet have a bit more structure than just a free-form note?
Put it in you Kase.