Revelation 13:18 is an invitation: let the one who has intelligence calculate the number of the wild beast. This series accepts it. Part 1 establishes from the text that the mark must be physical and that it is a mark OF the beast, so it will carry something from each of the beast's seven heads. Parts 2 and 3 follow the one false god the Bible itself keeps naming as Israel fell away, Saturn, under the names Apis, Moloch, Kaiwan and Rephan, and then through the ouroboros into the occult symbolism of the modern world. Part 4 identifies the star of Saturn and shows how it counts to 666.
Read the parts in order. Each one builds on the framework laid in the one before it.