Blocks are items which may be added to the right of your Moodle page. Blocks can be very helpful in adding functionality to your Moodle ISU course.
The Activities block lists and allows navigation between the different activities that are utilized in the course (assignments, forums, quizzes, resources, etc.).
Adding the Feedback block to your course will allow your students to access site-wide feedbacks such as course evaluations.
Using a calendar in a course can help both the instructor and the students keep track of deadlines and important dates within the course.
The Completion Progress block is a time-management and retention tool for students.