Content revised 21 October 2026.
Old Goal tutorials describe Universal Analytics, not the current GA4 event model. Define the important business action, then measure it with the supported event setup.
Start with a successful action
Specify what counts as a completed enquiry, registration or purchase. Check confirmation behaviour and duplicate handling. A click on the submit button is not automatically a received lead.
Review existing collection
Some interactions are collected automatically or through enhanced measurement, while others need additional implementation. Inspect the actual event and parameters. Avoid installing a second tag to solve an unclear reporting issue.
Mark importance deliberately
Use the current key-event feature for the actions that matter to the business. Keep website key events and advertising conversion configuration understandable rather than assuming all platform totals will match.
Test and record
Use safe examples, verify the received data and document the event name, trigger and owner. Changes should be dated so later comparisons remain meaningful. A key-event label does not prove business quality by itself.
Official guidance: Google key-event documentation.