KJV is a bad translation and confuses christians about "hell":
https://www.biblestudytools.com/dictionaries/smiths-bible-dictionary/hell.html
Example of Luke 16:23:
-KJV: And in HELL he lift up his eyes, being in torments, and seeth Abraham afar off, and Lazarus in his bosom.
-ASV: And in HADES he lifted up his eyes, being in torments, and seeth Abraham afar off, and Lazarus in his bosom.
-YLT: and in the HADES having lifted up his eyes, being in torments, he doth see Abraham afar off, and Lazarus in his bosom,
Example of Matthew 10:28:
-KJV: And do not fear those who kill the body but cannot kill the soul. Rather fear him who can destroy both soul and body in HELL.
-Philips: Never be afraid of those who can kill the body but are powerless to kill the soul! Far better to stand in awe of the one who has the power to destroy body and soul in the FIRES of destruction!
-YLT: And be not afraid of those killing the body, and are not able to kill the soul, but fear rather Him who is able both soul and body to destroy in GEHENNA.
Gehenna is a fire to destroy the wicked after final judgement:
https://www.biblestudytools.com/lexicons/greek/nas/geenna.html
Sheol (hebrew) and hades (greek) means the same thing, an undergound place where the wicked wait for judgement:
https://www.biblestudytools.com/concordances/naves-topical-bible/hades.html
Tartarus is a special place in hades reserved for the fallen angels:
https://www.biblestudytools.com/encyclopedias/isbe/hell.html