https://docs.magento.com/m2/ce/user_guide/content.html

CONTENT

In this section of the guide, you’ll learn how to create content and manage the presentation of your store.

Content Elements

Learn to create pages with text, images, and dynamic blocks of content that can be incorporated into your store navigation and linked to other pages.

Design & Theme

Your store’s theme can be changed for a season or promotion. Learn about page layouts, how to apply a new theme to your store, and simple design changes that you can make from the Admin.