Question: Does African spirituality have a heaven or hell? What happens after we die?
Different groups have different ideas of the afterlife, but most believe that we are our ancestors returned. It's sort of like reincarnation, but in the sense that we are carrying actual molecules that were programmed by our ancestry (DNA) but we are also physically and spiritually connected to everything else. So one's conduct can set a good or bad chain of destiny that you can't comprehend if you are only thinking of your basest momentary desires. So what the Yoruba call Iwa Pele or good conduct/character is crucial because it's not just about going to hell if you are bad, but starting a chain of suffering that you and whoever is touched by it will have to suffer from forever. It is much worse than hell. You have to come back and live in the hell that you created on Earth and possibly any other worlds and dimensions one exists in.
Speaking generally, most beliefs are reminiscent of the Hindu and Buddhist concepts of Karma, but it's not exactly the same. In the Congo, there is the saying, "No one births themselves or buries themselves." We all come into this world through others, and even if it is only the birds and worms, our bodies will be tended by others in the end. Along the way, we need others to survive. If no human helps us past infancy, we will still need to eat other plants and animals to live. Even a vegan needs some microbes. So one's destiny does not belong to one as an individual. Everything we do has far reaching effects regardless of our intention.
So one needs to step mindfully on this Earth, not for fear of eternal punishment, but because of the nature of existence itself.