I have felt for a long time that heaven was eternity in God’s presence and that hell was eternity separated from God. Descriptions of heaven and hell are by people who had no real frame of reference - as none of us would have - to put into words the wonder, or horror, of what God had revealed to them. They did their best using images from their experiences most closely related to their “revelations”. I believe that someday we will find out that they were true, as far as they went - heaven will be much better than described and hell will be much worse.
As for who goes to hell...I would say that those who actively separated themselves from God’s love in their life should expect to be likewise separated in the afterlife.
An interesting take on things is found in the Jewish Kabbalah, and their take on the creation myth (in the good sense of the word.)
They believe that God created the universe to discover if there was anything “not God”. To do so, God contracted from a vast, empty space, into which He injected a single particle, which was to endlessly replicate itself, becoming the physical universe. Once completed, the universe would reflect the image of God like a mirror, so God could see if there was anything “not God”. Having done so, the universe would cease to exist and again become part of God.
But inherent in this idea is that the universe exists within this contraction, this “absence of God”, so adding this to what I posted before would make physical reality, the universe, Hell. But this Hell is still inside the spiritual realm of God, and God may reach inside it to touch man, and man may beckon God to do so.
If man does not, he is in Hell. And if man beckons God, and God responds, then only man’s physicality is trapped in Hell. His spirit and soul may transcend the limitations of the flesh.