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Collections are temporary tables that store session-specific data in memory. They can be used for various purposes in APEX applications. Some uses of collections are:

• You insert, update, and delete collection information using PL/SQL API APEX_COLLECTION. This API provides several procedures and functions to manipulate collections and their members.
• Use collections to temporarily capture one or more nonscalar values. For example, you can use collections to store the results of a query, the values of page items, or the selections of a report.
• Collections can be accessed, manipulated, or processed during a user’s specific session. For example, you can use collections to pass data between pages, perform calculations on collection members, or create reports based on collections.

Collections do not enable you to store rows and columns in the current session into database tables. Collections are stored in memory and are not persistent across sessions.

The feature pages that can be created using the Create Page Wizard are About Page, Access Control, Activity Reporting, Configuration Options, Email Reporting, Feedback, Login Page, and Theme Style Selection. These pages provide application-level functionality that can be added to an existing application. Search Page and Unified Task List are not feature pages that can be created using the Create Page Wizard. Verified References: Managing Feature PagesFeature Page Types

 In Oracle APEX, you can choose from different authentication methods to establish a user’s identity and control access to your application. Authentication may require a user to provide some type of credentials, such as a user name and password, or could involve the use of digital certificates or a secure key. Three of the authentication methods that you can choose in Oracle APEX are:

• Custom Authentication Scheme: This method allows you to create your own authentication logic using PL/SQL code or an external web service. You can also customize the login page and session management for your application.
• No Authentication (using DAD): This method adopts the current database user as the authenticated user. This approach can be used in combination with a mod_plsql Database Access Descriptor (DAD) configuration that uses basic authentication to set the database session user.
• Built-in Authentication Scheme: This method allows you to use one of the preconfigured authentication schemes that ship with Oracle APEX, such as Open Door Credentials, LDAP Directory, Social Sign-In, and so on.

A stacked master detail is a type of master detail implementation that features two editable interactive grids based on two related tables or views. Users can select a row in the master grid to update the detail grid. Users can also interact with the master or the detail without leaving the page. A stacked master detail is suitable for scenarios where you want to display and edit data from a one-to-many relationship in a single page. You can create a stacked master detail using either the Create Application Wizard or the Create Page Wizard. Verified References: [Managing Master Detail Forms - Oracle Help Center], [Creating a Single Page Master Detail Using the Create Application Wizard - Oracle Help Center]