Cash flow is when you have money coming in (aka income) and money going out (aka expenses). So if you have more money coming in than going out, you have a positive cash flow. If you have more money going out than coming in, you have a negative cash flow. It's like a game where you can get points for having more money coming in than going out. To decide if you have a positive cash flow or negative cash flow, you need to make a list of all the money coming in and all the money going out. Most people do this over a certain amount of time, like a month or a year. Then you can compare the two lists and see if you have more entering or leaving. That's how you'd know if you have a positive or negative cash flow.