The goal of formatting is to increase the effective communication of the data at hands. Always consider the audience, setting, mode, mood, and consistency as you work through the iterative process of formatting. Look for formatting that adds value to your visualization, and avoid useless clutter. With an understanding of how formatting works in Tableau, you'll have the ability to refine the visualizations that you created in discovery and analysis into some incredibly effective communication of your data story.
In the next chapter, we'll look at how this all comes together in dashboards.