Use tabs to put related content and features on the same page, but in separate screens.

OUI docs for tabs

Tabs example on the Pages overview table

For example, "Pages," "Events," and "Attributes" are related, but contain separate overview tables and calls-to-action.

Small Tabs

You can also use smaller tabs for sub-components, or in space constrained situations, such as the editor's custom code.

Small tabs example in the editor

Javascript and CSS are separate tabs.