Many of the video series have an accompanying study guide. A study guide is a PDF e-book. The content of the study guide is generally the same as the video series, although the study guide is more likely to be updated. The study guides are organized by level of maturity: (1) beginner (coming soon), (2) intermediate, and (3) advanced.
A video "How to Use the Study Guides" will tell you much more about them.
There may also be draft study guides that are not fully completed.
A draft study guide is a guide that is not quite complete. Either it requires some editing after a live study developed it, or it only has partial material presented in order to support another guide.
The Revelation of God: This guide was produced during the live study. Since the information in it is quite mature it is being made available now. However, a rather large revision is planned. Once that revision is complete, a video study series will be recorded and the two related existing video series will be removed.
The live Zoom study is still available here: The Revelation of God