Answer:
I am a daily ritual involving using a metal tool on the body
I make billions of dollars selling windows. Who am I?
You use a knife to slice my head and weep beside me when I am dead.
I'm light as a feather yet the strongest person can't hold me for more than a few minutes. What am I?
I am easy to waste and unstoppable. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.