Drush is a command line interface that enables you to interact with your Drupal site without clicking around the graphical user interface (GUI).

A block is a reusable widget that is placed inside regions (layout containers) of your theme. Blocks can be used by site administrators on the Block layout admin page or provided by a module using the Plugin API.

Content modeling consists of identifying and constructing the different building blocks of data that compose the information on your site.

A layout can describe how various components are arranged on various levels—from an entire page from the header to the footer, to just the “middle” where the dynamic content goes, to individual components. It can apply to templates for managed content or one-off designs for landing pages.

A content type is a subtype of the [content entity](link to Entity topic). When a content creator goes to add new content to the site, they are presented with a list of content types to choose from to get the appropriate form to fill out.

Comments are a content entity type that allows users to leave commentary associated with a specific piece of content.

To ensure that your site and its modules continue to function correctly, a set of administrative operations should be performed periodically. These operations are referred to as cron tasks. Examples of cron tasks are: checking for module and theme updates, indexing content for search, or cleaning up temporary files.

Search provides internal site keyword search for content and users.

A site’s main navigation elements, whether they be in the header, footer, or sidebar, are composed of links built using Drupal's menu system. Drupal allows site administrators to build menus while also allowing module developers to add and alter menus in code.