I may have misunderstood your question, but perhaps this will help: “Empty” can be used about spaces and containers. If you want to say that there is nothing in a container or space, you can say: My cup is empty. My bag is empty. The room is empty. You could add the word “completely”, for emphasis: My cup is completely empty. If you are talking about not having something, you can say: I don’t have any money. I don’t have any knowledge of Japanese. If you want to stress that you have absolute nothing, you can add “at all”: I don’t have any money at all.