You can enable the following features as sections in a workspace: content, workpages, and forums. The content section allows you to add different types of content to your workspace, such as cards, widgets, applications, documents, links, and videos. The workpages section allows you to create and edit pages that display content in a flexible layout. The forums section allows you to create and participate in discussions with other workspace members. You can also subscribe to topics, receive notifications, and mark answers as helpful or correct. The applications and messages features are not available as sections in a workspace, but you can access them from other places. You can add applications to your workspace as content items or as tiles on your workpages. You can access messages from the notification center or from the SAP Mobile Start app. Reference:
Content section: [Content Section]
Workpages section: [Workpages Section]
Forums section: [Forum Section]
Applications: [Applications]
Messages: [About Notifications] and [SAP Mobile Start]

A shadow user is a user that is automatically created on the SAP BTP subaccount level when a user logs in to SAP Build Work Zone for the first time1. The shadow user is assigned the SAP BTP subaccount viewer role collection, which is required for accessing SAP Build Work Zone2. If a shadow user does not exist on the SAP BTP subaccount level, the user cannot login to SAP Build Work Zone. The other options are not valid reasons for the login issue, because:
SAP BTP global account viewer role collection is not required for accessing SAP Build Work Zone2.
Active default identity provider on SAP BTP subaccount level is a prerequisite for enabling SAP Build Work Zone3, but not a reason for the login issue.
SAP BTP subaccount viewer role collection is automatically assigned to the shadow user2, so it is not missing unless the shadow user does not exist. Reference: 1: Shadow Users 2: SAP BTP Subaccount Viewer Role Collection 3: Enable SAP Build Work Zone

Content packages enable you to easily install various types of content into your subaccount1. A content package is a collection of content items such as cards, workspace templates, home pages, workflows, and workspaces that are bundled together in a ZIP file2. You can create content packages in SAP Business Application Studio, and deploy them to SAP Build Work Zone using the Development Tools for SAP Build Work Zone extension3. Content packages allow you to bundle development and content artifacts to a single deployable unit (package) that can be easily uploaded and installed in your subaccount. Reference: 1: SAP Build Work Zone, advanced edition - SAP Online Help 2: Content Packages | SAP Help Portal 3: Create and Deploy Content Packages for SAP Build Work Zone Advanced Edition using BTP | SAP Blogs : SAP Build Work Zone, standard edition - SAP Online Help

The correct sequence of tasks for running the onboarding procedure for SAP Build Work Zone is as follows:
Set up Identity Provider: This step involves configuring the user management and authentication system for SAP Build Work Zone. The recommended approach is to use SAP Cloud Identity Services - Identity Authentication as the identity provider, but other options are also possible. This step requires creating a service instance of Identity Authentication in the SAP BTP subaccount and setting up the trust configuration between the subaccount and the identity provider12.
Run Booster for SAP Build Work Zone: This step involves using the SAP BTP booster feature to automate some of the setup steps for SAP Build Work Zone. The booster will create a subscription to SAP Build Work Zone, advanced edition, assign the required roles to the subaccount administrator, and enable the SAP Cloud Platform Launchpad service34.
Provision Identity Provisioning service: This step involves connecting the subaccount to the Identity Provisioning service and assigning the optional roles for theme editing. The Identity Provisioning service is used to synchronize users and groups between the identity provider and SAP Build Work Zone. This step requires creating a service instance of Identity Provisioning in the SAP BTP subaccount and configuring the destination and transformation rules .
Execute Work Zone Configurator: This step involves completing the steps of the SAP Build Work Zone configurator wizard. The configurator will guide the user through the final steps of the onboarding process, such as setting up the site name, logo, URL, and default language, as well as importing the initial content and users .
Reference:
Prerequisites
Setting Up User Management and Authentication
Run the Booster
SAP BTP Onboarding Series - Step-by-Step guide to activate your SAP Build Work Zone, advanced edition
[Post Booster Configuration]
[Creating User Lists]
[Run the Configurator]
[Onboarding to SAP Build Work Zone, advanced edition - Setup and Configuration]

Users can share feed updates including photos, comments and other status updates in the Workspace and Profile sections of SAP Build Work Zone, advanced edition. The Workspace section allows users to create and join workspaces that are dedicated to specific projects, teams, or topics. Users can post updates, share files, and collaborate with other members in the workspace feed. The Profile section displays activities and updates that directly affect the user on their profile wall. For example, the user will see all status updates and content posted by them or directly addressed to them (@mentions). The user can also see updates on changes to their profile information. The Tools section is where users can access various tools and applications that are integrated with SAP Build Work Zone, such as SAP Build Process Automation, SAP Build Application Studio, and SAP Analytics Cloud. The My Workspace section is where users can access their personal dashboard, tasks, notifications, and bookmarks. Neither of these sections allow users to share feed updates. Reference:
Workspace
Profile
Tools
My Workspace