Development artifacts are the components that are created or modified by developers to implement the business requirements of a project. In SAP Activate for SAP Build Work Zone, the development artifacts include launchpad plugins and UI integration cards. Launchpad plugins are extensions that enhance the functionality of the SAP Fiori launchpad, such as adding custom tiles, actions, or notifications. UI integration cards are reusable UI components that display data from different sources in a compact and user-friendly way. Home pages and workspaces are not development artifacts, but configuration artifacts. Configuration artifacts are the settings that are applied by administrators or end users to customize the appearance and behavior of the SAP Build Work Zone service, such as creating home pages, workspaces, or assigning roles and permissions. Reference:
SAP Build Work Zone Developer Guide, section "Development Artifacts"
SAP Build Work Zone Administrator Guide, section "Configuration Artifacts"

The SAP Workflow service provides three SAP Fiori applications for working with workflows in SAP Build Work Zone1:
My Inbox: This application allows you to access and manage your workflow tasks from different sources in one central place2. You can view, approve, reject, forward, or add comments to your tasks, as well as perform mass actions on multiple tasks2. You can also customize the layout and filter options of your inbox, and use the search function to find specific tasks2.
Monitor Workflows: Workflow Definitions: This application allows you to monitor the status and performance of your workflow definitions3. You can view the details of each workflow definition, such as the version, description, start conditions, and context data3. You can also see the number of workflow instances that are running, completed, or failed for each workflow definition, and drill down to the instance level3.
Monitor Workflows: Workflow Instances: This application allows you to monitor the status and performance of your workflow instances. You can view the details of each workflow instance, such as the start time, end time, duration, and current user task. You can also see the graphical representation of the workflow model, and the log entries for each step of the workflow execution.

To implement SAP Build Work Zone, advanced edition in a multi-tier landscape, you need to create subscriptions in separate SAP BTP subaccounts. This is because SAP Build Work Zone, advanced edition is a subscription-based service that requires a dedicated subaccount for each tenant. You cannot create multiple subscriptions or service instances in the same subaccount, nor can you create multiple sites within a single subscription. Each subscription represents a separate site with its own content, configuration, and users. By creating subscriptions in separate subaccounts, you can align your SAP Build Work Zone landscape with your core business system landscape and enable content transport across different tiers. Reference:
Explaining the Planning Landscape for SAP Build Work Zone
Getting Started With SAP Build Work Zone

Workspace types are the categories that define the visibility and accessibility of workspaces in SAP Build Work Zone. There are three types of workspaces: public, private, and external. Public workspaces are open to all users of the system and can be discovered and joined by anyone. Private workspaces are restricted to invited members only and cannot be searched or accessed by others. External workspaces are created for external users who are not part of the system and can only access the workspace through a unique URL. Hidden and recommended are not workspace types, but workspace attributes. Hidden workspaces are those that are marked as hidden by the workspace owner or administrator and do not appear in the workspace list or recommendations. Recommended workspaces are those that are suggested to the user based on their profile, preferences, or activities. Reference:
What are SAP Build Work Zone workspaces? |Summer Tutorial Series |Lesson 3: Workspaces, section "Step 1 - Creating a new workspace"
[SAP Build Work Zone Administrator Guide], section "Workspaces"