First of all, I suggest you go to the bookstore and read the books of Master nan huaijin. This book is a classic, which contains a discussion about the relationship between life and death, but not only this knowledge, but also other knowledge.
Second, you can read "The Wishes of the Tibetan Bodhisattva" to understand the concept of hell.
3. I remember that Li Juming, a Hong Kong geomantic master, published a book, which seems to be called "Li Juming on Life and Death". There should be something you are interested in.
Fourth, you can search the word-near-death experience on the Internet, and there are related reports.
Some tips, I hope I can help you.
Let's talk nonsense. In fact, this problem is ultimately a question of being a man. The first thing to be a man is to have a clean heart and be able to work for Riyuekun all his life. Then, it is not far from extraordinary.