UTM link builder
UTM parameters are five query-string tags — source, medium, campaign, content and term — that analytics tools read to attribute a visit. Source, medium and campaign are the three that matter; content and term are optional. Google Analytics treats them as case-sensitive, so Email and email become two separate rows.
How to build a UTM link
Medium is the field that decides which channel group a visit lands in, and it is where most tagging goes wrong. Use email, cpc, social, referral, affiliate or display; anything else falls into "unassigned" and quietly disappears from the default reports. The other common mistake is inconsistent casing, which is why the lower-case switch is on by default.
Questions
Source, medium and campaign in practice. Without a source, Analytics cannot attribute the visit and falls back to referral or direct.