There are notifications set up, so students should get a notification if a new lesson is added to the course they are enrolled in, however the notification will go to the email that they are registered with. the students need to ensure that those email addresses are actually been used, or at least been checked, knowing my son, he doesn’t check his emails frequently, not sure about others, but that will make matters easier.
Even for assignment feedback, student should be getting email notification if there is any feedback from the teachers
I hope that answered your question