Revelation provides translations to parables and exact quantitative measurements. It describes the Bride of Christ, given by God to Christ, as the City of God, descending from above, and measured by the angels, to be about half the size of the planet Mercury or slightly smaller than our own Moon. It is a descending city with a volume able to accommodate more than 47,000 trillion 1,000 sq. ft. 10 ft. high ceiling apartments. Heaven is also occupied by 100 trillion angels. It chronicles the final redemption of us as Adam's lineage by Christ's Way of Love, God's Breath or Light, and the Holy Spirit of Truth. The Second Death is mentioned a four times in Revelation. It describes the Final Judgment of all souls, including the followers of Satan. The Second Death is the death of the soul being cast into the Lake of Fire. As Christ said in Matthew [10:28]: “And fear not them who kill the body, but are not able to kill the soul: but rather fear him who is able to destroy both soul and body in hell.John presents in Revelation, a continuation of the Christian beliefs after the Gospels. In fact the Gospel of Matthew [13:30-40] also lays out Revelation's plot and provides most of the keys to the mysteries: “Let both [the good and the evil] grow together until the harvest: ... He that sows the good seed is the Son of man; The field is the world; the good seed are the children of the kingdom; but the tares are the children of the wicked one; The enemy that sowed them is the devil; the harvest is the end of the world; and the reapers are the angels. As therefore the tares are gathered and burned in the fire [same as the second death's lake of fire in Revelation]; so shall it be in the end of this world.” Also is Matthew [5:45], it states: “That ye may be the children of your Father which is in heaven: for he maketh his sun to rise on the evil and on the good, and sendeth rain on the just and on the unjust.” This is in agreement with Revelation [22:10-12], where it states: “Seal not the sayings of the prophecy of this book: for the time is at hand.  He that is unjust, let him be unjust still: and he which is filthy, let him be filthy still: and he that is righteous, let him be righteous still: and he that is holy, let him be holy still. And, behold, I come quickly; and my reward is with me, to give every man according as his work shall be.” A God that tolerates and allows evil to remain unchecked in Heaven and on Earth is seldom admitted by Christians.
So you can see that the Revelation plot is not an odd isolated fanciful plot solely dreamed up by John. The Revelation plot, in a parable, was indeed mentioned in the Gospels by Christ before the writing of Revelation. It states that the evil ones must exist unhindered to repeat their evil or good deeds till the end of time. Both are readied for the final harvest and separations, for some to possibly enter into the City of God. This makes perfect sense, as an explanation for why Christ did nothing to prevent the recurrence of sins, horrors, homicides, and abuses that he witnessed in his time and God's allowance, for evil to continue to be in our present world. Revelation [10:18] states the Final Judgment outcome "And the nations were angry ... they should be judged ... [to] give reward unto ... [Christ's] servants ... and ... [to] destroy them which destroy the earth." Indeed, those who are evil are currently destroying our Earth.
Revelation [20:11-12] also states that “from whose face [of God] the earth and the heaven fled away; and there was found no place for them.” and later on [21:1] “I saw a new heaven and a new earth: for the first heaven and the first earth were passed away; and there was no more sea.”
All true knowledge comes solely from the Holy Spirit of Truth released by Christ. Christ therefore did not write copious works for us to be saved with just an easy read.