Denial, anger, bargaining, depression, acceptance.
I bet you know what the stages are, even if you don't think of yourself as much of a psychology-type person. The stages are taught in introductory college courses, and were taught back when I was in hospice training. The stages are taught in grief and loss workshops. They come up in pop psychology and in clinical, scientific studies. The stages of grief are everywhere.
This means that many people, even professional psychologists, believe there is a right way and a wrong way to grieve, that there is an orderly and predictable pattern that everyone will go through, and if you don't progress correctly, you are failing at grief. You must move through these stages completely, or you will never heal.
This is a lie.
The 5 Stages of Grief and Other Lies That Don't Help Anyone by Megan Devine