The document outlines a 4 step guide to using functions in Excel 2013. Step 1 discusses the most commonly used functions like AVERAGE, COUNT, IF, and SUM. Step 2 explains that functions require an equal sign, function name, and argument. Step 3 details the argument and operators used in functions, such as + for add and ( ) for order of operations. Step 4 reviews relative and absolute cell references that can be used when filling cells. Following these 4 steps provides the foundation for using Excel functions effectively.