This post is a part of the AB-900: Microsoft 365 Copilot and Agent Administration Fundamentals Exam Prep Hub.
This topic falls under these sections:
Identify the core features and objects of Microsoft 365 services (30–35%)
   --> Identify the core objects of Microsoft 365 services
      --> Identify the appropriate objects to configure by using the SharePoint in Microsoft 365 Admin Center (sites, libraries, and folders)

Note that there are 10 practice questions (with answers) at the end of each section to help you solidify your knowledge of the material. Also, there are 4 practice tests with 30 questions each available from the hub's main page below the exam topics section.

Introduction

SharePoint Online is Microsoft’s cloud-based collaboration and content management platform included with Microsoft 365. It enables organizations to store, organize, share, and manage information securely.

The SharePoint admin center allows administrators to configure and manage SharePoint resources across the organization. For the AB-900: Microsoft 365 Copilot and Agent Administration Fundamentals exam, it is important to understand the key SharePoint objects:

• Sites
• Document libraries
• Folders

These objects form the structure used to organize files and collaboration content throughout Microsoft 365.

What Is SharePoint Online?

SharePoint Online is a service that provides:

• Document storage
• Team collaboration
• Content management
• Intranet sites
• File sharing
• Integration with Microsoft Teams and OneDrive

SharePoint acts as the underlying storage platform for many Microsoft 365 services.

For example:

• Files shared in Teams are stored in SharePoint.
• Documents used by Microsoft 365 Copilot may reside in SharePoint.
• Organizational knowledge can be maintained through SharePoint sites.

The SharePoint Admin Center

The SharePoint admin center provides centralized administration for SharePoint Online.

Administrators can:

• Create and manage sites.
• Configure sharing settings.
• Monitor storage usage.
• Restore deleted sites.
• Manage permissions.
• Configure policies.
• Control external access.

The SharePoint admin center focuses on organization-wide management rather than individual file management.

Understanding the SharePoint Hierarchy

SharePoint content is organized in a hierarchy:

Site
   ↓
Document Library
      ↓
Folders
         ↓
Files

Understanding this structure is essential for the AB-900 exam.

SharePoint Sites

A site is the top-level container used to organize information and collaboration resources.

Sites can contain:

• Document libraries
• Lists
• Pages
• News posts
• Permissions
• Folders and files

Think of a site as a workspace for a team, department, or project.

Types of SharePoint Sites

Team Sites

Team sites support collaboration among groups of users.

Typical uses include:

• Project teams
• Departments
• Committees

Features include:

• Shared documents
• Group calendars
• Microsoft 365 Group integration
• Teams integration

Example:

Finance Team Site

Communication Sites

Communication sites are designed for broadcasting information to larger audiences.

Examples include:

• Company news portals
• HR announcements
• Corporate intranets

Communication sites emphasize publishing rather than collaboration.

Site Permissions

Each site has permissions that determine who can:

• View content.
• Edit files.
• Manage settings.
• Share information.

Permission management helps organizations secure information while enabling collaboration.

Site Storage

Sites consume storage from the organization’s SharePoint storage pool.

Administrators can monitor:

• Storage usage
• Growth trends
• Available capacity

Storage management helps ensure sufficient space for users and workloads.

Document Libraries

A document library is a collection used to store and organize files within a SharePoint site.

Libraries can contain:

• Documents
• Spreadsheets
• Presentations
• PDFs
• Images
• Folders

A site may contain multiple libraries.

Example:

Finance Site

Libraries:

• Budgets
• Reports
• Policies

Benefits of Document Libraries

Document libraries provide:

Centralized Storage

Files are stored in one location.

Version History

Multiple versions of documents can be maintained.

Metadata Support

Documents can include descriptive information.

Searchability

Users can quickly locate files.

Permissions

Libraries can have access controls.

Default Documents Library

Most SharePoint sites contain a default library called:

Documents

Users commonly upload files into this library when collaborating through Teams or SharePoint.

Library Permissions

Libraries can inherit permissions from the parent site or have unique permissions assigned.

This allows organizations to:

• Restrict sensitive content.
• Separate departments.
• Protect confidential documents.

Folders

Folders are used within document libraries to further organize files.

Example:

Finance Site
   → Reports Library
        → 2025 Folder
             → Q1 Folder
                  → Budget.xlsx

Folders provide familiar file organization similar to Windows File Explorer.

Benefits of Folders

Folders help users:

• Group related files.
• Simplify navigation.
• Organize projects.
• Separate years, departments, or topics.

Files

Files are the actual content stored inside folders or libraries.

Examples:

• Word documents
• Excel workbooks
• PowerPoint presentations
• PDFs
• Images

Files stored in SharePoint support:

• Collaboration
• Co-authoring
• Search
• Version history

Version History

SharePoint maintains previous versions of files.

Benefits include:

• Recovering accidental changes.
• Viewing historical versions.
• Tracking modifications.
• Supporting collaboration.

Versioning is especially valuable when multiple users edit documents.

Integration with Microsoft Teams

Many Teams channels store files inside SharePoint document libraries.

Example:

Marketing Team
     ↓
General Channel
     ↓
Files Tab
     ↓
SharePoint Library

Although users may interact through Teams, the underlying storage is SharePoint.

Integration with OneDrive

OneDrive uses SharePoint technology behind the scenes.

Differences include:

External Sharing

Administrators can configure whether users can share:

• Sites
• Libraries
• Files
• Folders

External sharing enables collaboration with:

• Customers
• Vendors
• Partners

Organizations often balance collaboration with security requirements.

Why SharePoint Objects Matter for Microsoft 365 Copilot

Microsoft 365 Copilot can reference content stored in SharePoint.

Examples include:

• Policies
• Meeting documents
• Reports
• Project files

Copilot only accesses information users already have permission to view.

Well-organized sites, libraries, and folders improve search quality and help Copilot provide more relevant responses.

SharePoint Admin Center Tasks

Administrators commonly:

Manage Sites

• Create sites.
• Delete sites.
• Restore sites.

Configure Sharing

• Internal sharing
• External sharing

Monitor Storage

• View usage
• Allocate capacity

Manage Policies

• Access controls
• Site settings

Best Practices

Create Sites for Teams and Departments

Separate content logically.

Use Libraries for Major Categories

Avoid storing everything in a single library.

Use Folders Carefully

Too many nested folders can make navigation difficult.

Apply Appropriate Permissions

Protect sensitive content.

Maintain Consistent Naming Standards

Improve usability and search effectiveness.

Exam Tips

Remember these AB-900 concepts:

• A site is the top-level SharePoint container.
• Sites contain document libraries.
• Libraries contain folders and files.
• Team sites support collaboration.
• Communication sites support publishing information.
• SharePoint underlies file storage for Microsoft Teams.
• OneDrive is intended for personal storage.
• Version history helps recover previous file versions.
• Permissions control access to sites, libraries, folders, and files.
• Microsoft 365 Copilot respects existing SharePoint permissions.

Practice Exam Questions

Question 1

Which SharePoint object acts as the top-level container for collaboration resources?

A. Folder
B. Site
C. Document library
D. File

Correct Answer: B

Explanation: A site is the primary container that holds libraries, pages, lists, and permissions.

Question 2

Which SharePoint object directly stores files?

A. Team channel
B. Site collection
C. Document library
D. News page

Correct Answer: C

Explanation: Document libraries are collections designed specifically to store and organize files.

Question 3

A company wants to publish organization-wide news and announcements. Which type of SharePoint site is most appropriate?

A. Team site
B. Project site
C. Communication site
D. Personal site

Correct Answer: C

Explanation: Communication sites are optimized for sharing information with large audiences.

Question 4

What is the purpose of folders within a SharePoint library?

A. Create Microsoft 365 Groups
B. Assign licenses
C. Replace sites
D. Organize files into smaller categories

Correct Answer: D

Explanation: Folders provide additional organization within document libraries.

Question 5

Which statement about Microsoft Teams file storage is true?

A. Teams files are stored in Exchange Online.
B. Teams files are stored in OneNote.
C. Teams files are stored in SharePoint Online.
D. Teams files are stored only on local devices.

Correct Answer: C

Explanation: SharePoint Online serves as the underlying storage platform for Teams files.

Question 6

Which feature allows users to restore previous versions of a document?

A. Retention labels
B. Site templates
C. External sharing
D. Version history

Correct Answer: D

Explanation: Version history maintains older copies of files and supports recovery.

Question 7

What is the primary purpose of OneDrive?

A. Organizational intranet publishing
B. Team collaboration storage
C. Personal file storage
D. Email management

Correct Answer: C

Explanation: OneDrive is intended for individual users and personal work files.

Question 8

A SharePoint library can have its own permissions that differ from the parent site. What does this provide?

A. Independent security for specific content
B. Automatic licensing
C. Increased mailbox capacity
D. Dynamic distribution capabilities

Correct Answer: A

Explanation: Unique permissions allow administrators to protect sensitive libraries separately from the overall site.

Question 9

Which object is directly above folders in the SharePoint hierarchy?

A. Files
B. Lists
C. Pages
D. Document libraries

Correct Answer: D

Explanation: Libraries contain folders, which in turn contain files.

Question 10

Why are well-organized SharePoint sites beneficial for Microsoft 365 Copilot?

A. They bypass permissions.
B. They improve content discovery and relevance.
C. They automatically increase storage quotas.
D. They eliminate version history.

Correct Answer: B

Explanation: Organized SharePoint content helps Copilot retrieve more useful information while respecting user permissions.

Go to the AB-900 Exam Prep Hub main page