how to create notification for new employees regarding enrollment to courses?

Summary

how to create notification for new employees regarding enrollment to courses?

Content

Hello,

In learning we would like to have automatic notifications for NEW EMPLOYEES,
once they are enrolled to activities.
I understood the learning notification method is ALERTS,and looking for documentation
regarding new employees events and method to implement this case.
(or maybe there is an already alert like this exists) / if you could share some ideas/examples

See attached file,
Thanks
Revital