Goldie gets every month a pocket money from her parents. That is, the money she can spend for what she wants, or save it. To keep track of her money, she keeps a record of how much she spent and how much she spared.
Do you also get pocket money and want to keep track of your money? Are you saving on something you want very much? Maybe it will help you to be together with Goldie to write down your income (money you receive) and expenditure (money you spend).