Formatting rules
The following formatting rules encompass fonts, lines, and bands. Fonts are, of course, an obvious formatting consideration. Lines and bands, however, may not be something you typically work with—but in Tableau, lines and bands should certainly be considered. This illustrates that data visualization is closely related to graphic design, where lines and bands play a much bigger role than they do in, for example, Excel, and that formatting considers much more than just the textual layout.
Keep the font choice simple
Typically, using one or two fonts on a dashboard is advisable. More fonts can create a confusing environment and interfere with readability.
Fonts chosen for titles should be thick and solid, while body fonts should be easy to read. In Tableau, choosing appropriate fonts is simple: select Format | Font to display the Format Font window to see and choose the fonts you like.
The Tableau fonts always work, like Tableau Bold, Tableau...