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A placeholder key is a unique identifier that is used to refer to a specific placeholder in the presentation details of an item. A placeholder key is defined in the placeholder settings item that is linked to a rendering or a sublayout. A placeholder key can also be defined in the code or markup of a component. A placeholder key can be static or dynamic. A static placeholder key has a fixed value, such as /main. A dynamic placeholder key has a variable value, such as /main-{GUID}, where {GUID} is replaced by a unique identifier at runtime. Dynamic placeholders allow multiple instances of the same component to be added to a placeholder without conflicts. References:

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Partial view components are generally for lightweight components on a Sitecore page that do not contain their own content, such as structural components that contain just placeholders1. Partial view components are similar to partial views in ASP.NET Core, but they are invoked using the Html.Sitecore().Rendering() method instead of the Html.Partial() or Html.RenderPartial() methods2. Partial view components are useful when you want to render multiple placeholders within a component, such as a header or a footer3. References:

• View types | Sitecore Documentation
• [Sitecore 10 .NET Developer Certification Study Guide], page 18
• Sitecore Documentation: Partial views

The Experience Editor, the Content Editor, and the Workbox are three areas of Sitecore that allow you to view the available workflow commands of an item you are editing. The workflow commands are the actions that you can perform on an item in a workflow, such as Submit, Approve, Reject, or Publish. The workflow commands are displayed in different ways depending on the area of Sitecore you are using:

• In the Experience Editor, the workflow commands are displayed in the Workflow group on the Review tab of the ribbon1.
• In the Content Editor, the workflow commands are displayed in the Workflow group on the Home tab of the ribbon2.
• In the Workbox, the workflow commands are displayed as buttons in the workflow state pane for each item3.

The Security Editor, the Workflow Command, and the Path Analyzer are not areas of Sitecore that allow you to view the available workflow commands of an item you are editing. The Security Editor is a tool that allows you to manage access rights for users and roles4. The Workflow Command is a template that defines the properties of a workflow command, such as the name, the next state, and the actions5. The Path Analyzer is a tool that allows you to analyze the paths that visitors take on your website. References: 1: https://doc.sitecore.com/xp/en/users/101/sitecore-experience-platform/the-workflow-group.html  2: https://doc.sitecore.com/xp/en/users/101/sitecore-experience-platform/the-workflow-group-in-the-content-editor.html  3: https://doc.sitecore.com/xp/en/users/101/sitecore-experience-platform/workflows-and-the-workbox.html  4: https://doc.sitecore.com/xp/en/developers/101/platform-administration-and-architecture/the-security-editor.html  5: https://doc.sitecore.com/xp/en/developers/101/sitecore-experience-manager/defining-workflows.html : https://doc.sitecore.com/xp/en/users/101/sitecore-experience-platform/path-analyzer.html

 If the Sitecore Content Management instance can be accessed by multiple host names, you need to add AllowedCorsOriginsGroup for each site to the Identity Server configuration. This will enable the users for each site to be able to log in to the Sitecore shell using the Identity Server. The AllowedCorsOriginsGroup element defines a group of URIs that are allowed to make cross-origin requests to the Identity Server. You can use multiple subnodes to define more than one URI, or you can use the | symbol to separate URIs within a node. You can also use the {AllowedCorsOrigin} template to simplify the configuration. When you use that template, all origins (hosts) are notified about the sign-out1. References:

• Single sign-out