This is a question that many have attempted to answer but just cant. Though people can die for like 3 minutes and then come back to tell the tale, it's always different for everybody. Could death and the afterlife truly be different for everyone, and there is no set fate for where our souls go? Many religions attempt to answer this, and they're all different. In Christianity, when one dies they either go to heaven or hell. In Islam, when one dies their soul is judged by two angels and then they got to wait for judgement day. In Buddhism, when one dies and they haven't reached nirvana, they get reincarnated. These are some pretty big religions on earth and their beliefs on death are all very different.
I read a book once about people who were dead for a couple minutes and then brought back to life, and all their experiences were different. some people saw their dead family members. some people were in a park or some shit. one lady was just surrounded by darkness. Wtf happens when we die?? There is no answer. There is just waiting.