Then stay on here and ask questions, Trinity! There is a wealth, and a great variety of wisdom and experience on GN, and you should find people who understand whatever situation you are in.
I can't see any call, or use at all for a course in grand parenting - each family is different and so are the needs. You really do learn as you go with DGC, recalling all your own experiences with your parents and grandparents, and having the love you all share as a foundation for it all.
Just one tip - don't interfere, and count to ten before you say anything critical. New parents are sensitive plants.