This is my study:
Strong's Exhaustive Concordance: Hell
Hebrew # 7585 Sheol, Hades, or the world of the dead, grave, hell, pit
Greek # 86 place of departed souls, grave, hell
Greek # 1067 Gehenna, the Valley of the sons of Hinnom South of Jerusalem, figuratively and literal of place of punishment.
Greek # 5020. Tartaroo tar-tar-o'-o from Tartaros (the deepest abyss of Hades); to incarcerate in eternal torment:--cast down to hell.
Gehenna - Valley of Hinnom, Old Testament as Gai Ben-Hinnom, Tophet, in the Talmud as Gehinnam
The oldest historical reference to the valley is found in Joshua 15:8, 18:16 which describe tribal boundaries. The next chronological reference to the valley is at the time of King Ahaz of Judah who sacrificed his sons there according to 2 Chron. 28:3. Isaiah does not mention Gehenna by name, but the burning place, Isaiah 30:33 in which the Assyrian army are to be destroyed, may be read Topheth, and the final verse of Isaiah which concerns the corpses of the same or a similar battle, Isaiah 66:24 , where their worm does not die. Also read Jeremiah 19:6-8 as a reference to the dead bodies that are thrown over the wall of Jerusalem into Gehenna/Tophet.
Matthew 5:29, 30; Mark 9:43-48 Jesus uses the prophetic symbolic of Gehenna as calling it hell or fires of hell meaning the grave/pit where many were burned to death there as the worm did not die there, meaning that there were always new maggots going through their life-cycles, feeding on the dead corpse. Also note Isaiah 66:24.
God said that he would that none should perish, but those who have rejected God and His word are those who will be cast into the lake of fire for eternity by their own choice, even if they do not believe in Heaven or Hell, we believe because we know that Gods word is truth and does not come back void in our lives.
Revelation 20:11 And I saw a great white throne, and him that sat on it, from whose face the earth and the heaven fled away; and there was found no place for them.
Revelation 20:12 And I saw the dead, small and great, stand before God; and the books were opened: and another book was opened, which is the book of life: and the dead were judged out of those things which were written in the books, according to their works.
Revelation 20:13 and the sea gave up the dead which were in it; and death and hell delivered up the dead which were in them: and they were judged every man according to their works.
Revelation 20:14 and death and hell were cast into the lake of fire. This is the second death.
Revelation 20:15 and whosoever was not found written in the book of life was cast into the lake of fire.