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The only real recommendation that i have on grunfeld is a book by the famous Bent Larsen. It is called ZOOM, zero hour for operatve opening models. The book is 400 pages with over 500 grunfeld pawn structure games. Larsen is of the opinion that you need to learn patterns and he organises the book around all different patterns that he finds relevant with a grunfeld pawn structure. Both for black as for white, when playing a reversed grunfeld.
Hmm....dats perfect. ..I played few games in blitz in French defense but opponent replied with some unusual move order I lost dat game properly because I was not sure what he's doing....my point is people who are not aware of certain openings replied in unusual way which was not covered in video I saw on French.....