https://www.ucg.org/bible-study-tools/booklets/heaven-and-hell-what-does-the-bible-really-teach
Above is the link to a great booklet that covers Heaven and Hell. Especially, read pages 15-28 about Hell.
In my opinion, I think it is a great writeup of the information in easy-to-understand format and wording.
It, also, clears up “why the new Jersuleum” comes down to the “new Heaven”. When God melts Earth with great heat, the saved in their immortal bodies will need to be somewhere until Earth is renewed to a pristine state.
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By the way pages 12-14 are poorly written about death. Saved Human Spirits return to God in Heaven. Saved Earthly body returns to the soil. At the Rapture, when Jesus calls, saved Spirit Bodies join with the saved Spirit that is in Heaven and the saved receive their “Glorified Immortal Bodies with their Spirit. All who are saved then return to Heaven and at the time of Jesus’ return to Earth at the beginning of the Millennium return with Him to Earth during that time. This process is Biblical. You can research it. Start in Ecc 12:7.
When reading any written articles [especially Beyond Today], look up all scriptures given and also do your own research of ALL scriptures on the topic. This advice includes this Blog.