So this is actually a cook book. But it has a lot of good info about the keto diet in general, common keto ingredients and lots of good recipes. Not to mention it's very well put together, the photos are beautiful. And the price has dropped!
The Ketogenic Cookbook: Nutritious Low-Carb, High-Fat Paleo Meals to Heal Your Body https://www.amazon.com/dp/B011CX8UZA/ref=cm_sw_r_cp_apa_EAGZAb0YZKXBE
The Ketogenic Cookbook suggests mixing equal parts tallow and duck fat for something that melts and spreads more like butter.