This document outlines five things the author wishes they knew when first starting to use Tableau. It discusses: 1) the different Tableau license types and their uses, 2) the importance of properly shaping data before analyzing in Tableau, 3) the difference between dimensions and measures, 4) the difference between discrete and continuous fields, and 5) introduces some corporate-focused chart types like sparklines, small multiples, and bullet graphs. The document is presented by Ryan Sleeper from Evolytics to help others learn from his experience using Tableau.