The Gujarati words (in italic) used in the recipes are ingredients easily available in Indian grocery stores with the same names.
As a home cook for your everyday cooking you cook with your instincts and habits rather than following a recipe and measuring ingredients. I have tried to be as accurate as possible with measurements of the ingredients. For green chilies and chili powder, choose them according to the spice level you are comfortable with. I use jalapeno as green chili for most of my cooking. Usually most households keep a week worth of minced jalapeno, ginger and garlic in their refrigerator