We all have to deal with grief at some times in our lives. This talk by Dr Lucy Hone is excellent in helping.
A close relative had a significant loss recently and told me the talk helped her a lot. She said she watched it every day.
While I have summarised the key points that I see, you need to watch it to realise its value.
https://www.ted.com/talks/lucy_hone_the_three_secrets_of_resilient_people