If you use Power BI you have written DAX. DAX can be complicated and understanding better how the DAX Engine works can help you write better performing DAX. There are a couple of third party tools which can help, so we will review Bravo, a relatively new free tool you may not know about and DAX Studio. We will use those tools when we review DAX Formatting with Bravo, context transition, different filtering methods and why you would use them, Calculated tables, USERELATIONSHIP() tricks, when to use VALUES, and validating performance with DaxStudio. After this session you will be able to incorporate some useful tools, write better performing DAX, measure the performance and better understand the DAX Engine in Power BI.