Workout Code was one, especially as it is a default on the Overview page.
But more generally, as I look to use Golden Cheetah more fully, I'm realizing that I don't understand the data model at all. And what is / isn't possible. For example, I have daily weight & other metrics data in Garmin connect going back the last several years, which I'd like to import into GC. I found a discussion on importing weight via a file upload, but the example was Kg based. I had to ask on the forum if there was an equivalent capability to upload in lbs to get the answer that weight import only works in Kg. It's these types of questions where having a data dictionary would be helpful for new users.