How do you understand death?

I understand Death as the inevitable, definite conclusion of a stage of existence. Unlike one taking a next breath, evolving a next thought, believing you no longer need to learn.

I'm fortunate to not "miss" the people, I have known, who are no longer sharing the human experience. They are "on too something else" though I have no idea nor the ability to know what that is. We can only guess, and it is estimable that "they" would not want me to use precious time to grieve.