🙄When adding a source like an obituary I can select to tag it to Name, Sex, Birth, Christening, Death, Burial which are all good. Why can I not tag Marriage?
You can tag a source to a marriage event, but not when you are doing sources for a person. A person cannot have a marriage event; rather, a marriage event is connected to a couple relationship between two persons. When you are viewing the couple relationship (which you can get to by clicking the pencil icon to the right of the marriage in the Family Members section of a person page), you will see a list of events and a list of sources. If there are sources attached to the couple relationship, then you can tag a source to a marriage event. You can start from the event and tag the source, or you can start from the source and tag the event (both actions have the same effect).