There are several pre-built default values for traffic sources and mediums included in the Analytics Campaign Tagger Excel spreadsheet.
These include channels such as Paid Search, Social media, Display networks, Email, Affiliates and Offline.

In addition, there are some advanced options such as the "no override" parameter (utm_nooverride) to choose whether to attribute the first referral (traffic source) to your conversions instead of the default last referral.