Do I need to add a connection field to both of the objects I want to connect together?
No, you only need one connection field. Adding a connection field to both objects can confuse things in your live application.
Which object should I add the connection to?
For one-to-many connections, it generally works best to add the connection to the many, or "child" object. For many-to-many, add the connection to the object that you'll be editing in the live app to manage those connections.
Do I need to track unique ID or key fields?
No, Knack manages all the connections behind the scenes without needing key or ID fields.
If I delete a parent record will all the connected child records also be deleted?
No, the child records will not be deleted.
How do I delete a connection?
From the data tab in the Knack builder, select the object whose connection you would like to delete. Locate the connection field among your list of fields, hover your mouse over it, and click the x on the right side: