When I started studying for the CSSD I found there weren't many resources online. This 28 page outline is what I created to help me study.
It pulls together resources from AND, SCAN, CPSDA, the Sports Nutrition Care Manual and more. Throughout there are linked videos for further explanation of metabolic processes and a reference sheets for additional research and reading.
Topics covered - Principles of energy metabolism, macronutrients, vitamins, minerals, antioxidants, hydration, supplements, clinical sports nutrition, weight management, special diets, and more.
If you have further questions I would be more than happy to answer them!
Good luck studying!