Formulas make Excel smart. With out them, Excel is just a data keeping tool. But by using formulas, you can crunch data, analyze it and get answers to most complex questions. While anyone can use a simple SUM or IF formula, an advanced user of it would be able to seamlessly write & combine formulas like SUMIFS , SUMPRODUCT, INDEX, MATCH, LOOKUP formulas. Apart from knowing the formulas, advanced Excel users know how to debug them, audit them and how to use which formula for which occasion and they also know few alternatives for any given formula problem