I have some things to understand in the Google tag manager, I am a little new and need some inputs. I quite don't understand what the Field to set option in more settings is all about. What does it do and what are these over ride settings in it?
Could anyone help me understand this part of Google TM and how it can be helpful?
This document lists all of the configurable field names for analytics.js: https://developers.google.com/analytics/devguides/collection/analyticsjs/field-reference
By specifying the name of the input field you can override the value for that specific information. For example, if I wanted to anonymize the IP (https://developers.google.com/analytics/devguides/collection/analyticsjs/field-reference#anonymizeIp) of the sent hit I would write as name of field anonymizeIp and value equals true.
If you want to override the title (https://developers.google.com/analytics/devguides/collection/analyticsjs/field-reference#title) of a page you can set title as field name and a Custom JavaScript variable as value that generate dynamically the string of the title.
The same criterion applies to the other fields.
Example:
