In Buddhism, what does "beginning and ending the afterlife" mean?

From the beginning: Buddhist term, which means that there is no beginning in the past, and it is called "no beginning". From the beginning, it refers to our past lives.

Before extinction: refers to every previous death.

The afterlife; It refers to every cycle of life.

In the past countless lifetimes, our lives have died again and again, reborn again and again, and again.