Admin Notifications refer to the notifications you can receive at your selected email address upon certain events, such as a new sign-up.
Go to Settings → Notification emails → Admin settings:
Notify e-mail
Insert the email address you want to receive the notifications in the Notify e-mail field.
You can add more than one notification email (comma separated with no gaps)School Admin notification events
Select the user's actions that, as an admin, would like to receive emails upon:
User Sign up, New Purchase, Social Post, Social Comment, Assignment, Cancellation of Subscription/Payment plan, Affiliate Sign up, Email lead capture, Course enrollment of a seat offering, Login as a User, On form submission, On new NPS score.
Notify Instructors
You can decide if you want to notify your instructors of various events at your school.
Instructor notification events
Instructors can receive a notification when someone purchases their course and/or when an assignment is submitted.
The notification emails sent to admins and instructors require the Messenger (Inbox) option enabled under Settings → Community access. 
Teacher support account
You can insert a Teacher your students can contact with questions about the courses. If you add a Teacher support account, you will need to add the Teacher Support option at your After Sign in/up topbar (Edit School Site → Edit School Topbar) so that users can contact the connected account.
You can find more information in our respective article.
Technical support account
You can insert a Technician your students can contact with technical questions about the platform. If you add a Technical support account, you will need to add the Technical Support option at your After Sign in/up topbar (Edit School Site → Edit School Topbar) so that users can contact the connected account.
You can find more in our respective article.
Teacher who grades
When a user submits an assignment, the Teacher account will get a notification to grade their answers.
To connect an account, type @ following the username of your user, and click the name from the pop-up list.