There is a Zapier trigger when a field is created, and a Zapier action to update existing records.
However, there is no Zapier trigger that uses a record being updated as a starting point.
For example, I can have a Zap that says when a new customer is added to my base, add them to a Mailchimp list. When the new record is added, I have a single select called โStatusโ. When the customer is added, this is set to โLeadโ.
If this customer moves to โDealtโ, it would be great to able to move that customer onto a different targeting list on Mailchimp. However, because โWhen a record is updatedโ isnโt available as a starting point, a lot of potential actions are ruled out.