There are many free online resources related to grief and loss. Here are a few helpful links:

• "Coping with Grief and Loss" from HelpGuide.org
• "Grief and Loss" from Johns Hopkins Medicine
• "What is Grief?" from Cleveland Clinic
• "Nursing Grief and Loss" from the National Library of Medicine
• "Grief and Bereavement" from the American Cancer Society
• "Commonly Asked Questions about Grief and Loss" from PsychCentral.com
•  "Grief Talk with Michele: Conversations to Support Healing" (Facebook page)
• "Relational pastoral care and counseling: a practical theological exploration of relational spirituality and grief,"  by Joel A. Jueckstock: a PhD Dissertation, free online from Luther Seminary's Digital Commons

Gottfried Leibniz coined the term "theodicy" to justify God's existence in light of the apparent imperfections of the world.  Here's a brief overview from WIkipedia on what is meant by 'Theodicy'; and here are a few essential books that delve into Theodicy as is relates to the problem of suffering, grief and loss (additional titles displayed at bottom):

The Image of God: the Problem of Evil and the Problem of Mourning by Eleanor Stump (2022; ISBN: 9780192847836);

The Problem of Pain, by CS Lewis (ISBN: 978-0060652968);

Christian Faith and the Problem of Evil, by Peter Van Inwagen (ISBN: 9780802826978).  

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"With all this suffering, how could there be a God?" | Tim Keller at Columbia University: A brief YouTube video on "theodicy"

Boston College Professor of Philosophy Peter Kreeft on "God and Suffering"--a brief YouTube video

John Lennox (Oxford) explores the question, "Where is God in suffering?" | Harvard Medical School, 2014: a 1-hour YouTube video