These are the two books that have helped me the most: https://smile.amazon.com/dp/1571988459/ https://smile.amazon.com/dp/1603426949/
If videos are more your speed, check out Epic Gardening or The Millennial Gardener on YouTube. They both have terrific info about different things.
I’m truly sorry for your loss. As someone who just recently lost his father, too, I know all too well how much it can hurt. Take care of yourself :)