If you are experienced with spreadsheets you can also add extra features such as the ability to create graphs from the data you entered. Graphs make it easy to get a quick view of your current financial situation. The graphs will allow you to easily spot trends and areas that are in need of attention in order to keep you on budget.
Rent or mortgage, homeowners insurance or renters insurance, all utility bills, auto loan or auto insurance payments, gas for your vehicle, food for home, and so forth. Once again, these are items that you cannot live without.