The Style Guide allows you to view a generic template of your theme. It simplifies your theme so you can better understand where certain Regions are located. A Region is where you can place your Block content, and they cannot be changed by the user.

This feature also enables you to toggle between a one-column, two-column, and three-column layout -- essentially viewing your theme with or without sidebars.

Next, we will be talking about Search Engine Optimization.