How to check the cash position of a business?

I am an investor and have little knowledge of accounting statements. I usually check the cash position of a company by verifying whether the cash from operations is a positive figure or not. I also check the reserves in Balance sheet. I make sure that cash from financing and investing are not too much positive figures. But as a professional, how do you actually examine the cash status? Where can you check the total cash available in a zero debt business ? Does it reflect in just reserves and surplus? Tell me the professional way.