Here are some additional thoughts about preparing for death beyond the death book template previously shared.
Make a book for each person. Do NOT co-mingle information unless the information is in all appropriate books. And better, note that the information is in another book.
Passwords. Make someone aware how and where you keep your passwords. This can be tricky, for sure. But find a way.
Think about your digital life. For example, decide what you want to do with email, social media, and suubscriptions. Write it down and make sure the person whose responsibility it will be knows and has access.