Protein on the ketogenic diet is important as it contains essential amino acids. But quality is more important than quality when it comes to consuming it.
Fats and Oils will be the primary source of your daily macronutrient requirement while on the ketogenic diet. It is however important that these fats originate from healthy fat sources.
Understanding the glycemic index is important for you to know so that you can understand how certain foods affect your insulin. Insulin spikes trigger fat storage if you aren't eating smart.