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You put the UTM code on the URLs before sharing the links with someone, or put the link on a 3rd party website. When a visitor comes using the URL, GA will register the traffic under referral, and you can use the Medium / Source / Campaign to figure out the actual number of visitors.
You can use the template to create the UTM URLs: [https://whizzpeople.com/utm-codes-for-tracking-gbp-traffic-in-ga4-gsc/](https://whizzpeople.com/utm-codes-for-tracking-gbp-traffic-in-ga4-gsc/)
