Add a record with every purchase or any waste of money. When funds are received, check the "Arrival" checkbox. You must enter the name of the expense / income (cost / income item) and the amount, for example: Taxi 270 rubles, Household goods 1450 rubles. Lunch: 190 rub. etc. There is no need to make detailed entries, just enter the total amount of the check. Thus, for a certain period, the database will contain information about costs and amounts that can be analyzed. As a result, you can understand how much you spend per month in general and by cost item. Using this information, you can optimize your spending. It is possible to synchronize your expenses on 2 devices via a disk on the Internet. In this way, two people will be able to manage common expenses.