Those who have done harm to others, society, and the world in human society... and have not completely redeemed their sins will go to hell.
There are 18 levels of hell, and the number of levels of hell is determined by the size of the remaining sins after redemption. You can also practice in hell. If it is a level 1 hell, you can get out of hell after practicing for a short period of time.
People outside hell can redeem the sins of people in hell, and they can get out of hell if they have no sins. For example, redeem for benefactors, redeem for relatives, redeem for friends, and redeem for good people...