Field ID
The ID field is the ID of your field, which is used to link to this field. The field ID is always lowercase. The field's ID is set when creating a new field using camel casing. You need the field ID for the configuration of filters or display patterns.
The ID is automatically created from the name you insert:
Example: You insert the field name "My NeW fielDs #1 Purpose?
Automatic Id: myNeWFielDs1Purpose
You can open the Display Pattern Editor to see the JSON of a Content Item.