The purpose of tracking links is to create a unique URL that will only be used in one marketing campaign at a time. You can see the traffic from that one source by adding a unique link to the campaign. The code for a link tracks user interaction for that link only, so the report for each tracking link is unique to the specific link.
Read more on How URL Tracking works >> https://medium.com/@cesar_zowa/tracking-url-how-does-it-work-8499adfa54a5