Indian cooking is all about the combination of spices. I have not met a single person who has not posed the question “Do you know how to make curry?”. Curry seems to be the name given to almost any Indian dish. So lack of a better term here are the basic ingredients for any “curry” dish.
For the gravy part
Usually all of the above are sauted in a little bit of oil and blended into a paste
Dry roast and powder. A coffee grinder comes in handy
Once you have this handy cooking chicken/fish/vegetables is a breeze