Excel!

Microsoft Excel is rapidly becoming one of the most useful tools in the business world.
You can do a lot of things with Excel and there are many advantages to using it.
Excel provides you with an easy way to enter data and formulas that your company needs.
It is an easy and organized way to display any data that you may need to reference to run your business.
Ample knowledge of Excel can make you very marketable as an employee with many more companies
willing to hire you if you master it.