Campaign reports are easier to read when everyone uses the same names for the same activity.
Choose a small set of source and channel labels and keep them in a shared sheet. Add a convention for the campaign name, such as product, month and purpose. For a newsletter promotion, record the destination and its tagged link together so a colleague can copy the right version.
Test the link in a browser and check whether a visit shows up in the expected report. Keep personal details out of campaign tags. Review your label list occasionally and agree how to handle existing reports before renaming categories.