I'll ask @tisto to explain the terminology a bit better. In the meantime, let me say that this is a place to discuss the idea, so if you're interested in GatsbyJS maybe you could chime in with your thoughts about how we could make a site generator add-on that used Plone as a data source. That might mean learning a bit about what Plone is, and how it works. You can begin by working your way through the steps outlined at the top of this post.