When you click into a forecast in Helm the first screen you will see has two graphs. These boil your business information down into easy to understand visuals.
The line graph at the top of the page is your business' cash balance. This is the amount of money left in your bank account (or bank accounts!) at the end of each day.
The bar graph at the bottom of the page shows all of the "ins and outs" for your business. Bars above the zero line are "cash in" items and bars below the zero line are "cash out" items.