Explanation
A remote server in the context of REST Data Sources is a configuration that defines how to connect to an external server that hosts one or more REST services. The remote server determines the base URL of the REST Data Source, which is used to construct the full URL of each REST operation. Multiple REST Data Sources can reference a single remote server, which simplifies the maintenance and security of accessing external REST services. Verified References: Managing Remote Servers - Oracle Help Center, Creating REST Data Sources - Oracle Help Center

Explanation
Cards are a page type that display information in a grid layout of tiles. Each card can contain an image, a title, a subtitle, and an optional link. Cards are suitable for presenting summary or overview information in an attractive and compact way1 Verified References: 1: Understanding Page Types, Features, and Settings - Oracle Help Center

Explanation
When you create an Access Control Page using the Create Page Wizard, three of the following Access Roles get created: Reader, Administrator, and Contributor. These roles are predefined by APEX and correspond to the authorization schemes that control the access to the application, pages, or page components1. Reader role grants read-only access to the application. Administrator role grants full access to the application, including administrative and edit privileges. Contributor role grants edit privileges to the application, but not administrative privileges2. Developer role is not a default Access Role created by the wizard, but you can create your own custom roles and assign them to users on the Application Access Control page.

Explanation
A modal dialog is a type of page mode that displays an overlay window within the viewport when a button is pressed. A modal dialog is a stand-alone page that does not interact with the base page where it was launched.
A modal dialog blocks access to the base page until it is closed by the user. A modal dialog can be used for various purposes, such as displaying additional information, confirming an action, or collecting user input.