I've been sharing some videos and vlogs on Revelation. It's very difficult to teach because there are so many different opinions. Right now I'm going to give you what some people consider to be a key to Revelation. That has to do with Revelation 12 and 19. Some believe these are the Advent teachings.

Patheos Article: Revelation 12 | story within a story https://www.patheos.com/blogs/jaredingle/2021/07/revelation-12-story-within-a-story/

YouTube lead-in: some ideas about Advent in Revelation #shorts https://youtu.be/ENMbNGrcTyA