Here is an overview of all of the different types of assignments in the course. You can find the detailed directions for the assignments and the grading rubrics in the module where they are assigned.
The projects in each module can help you practice what you learned and apply it to solve a problem. They can prepare you for the proctored assessments.
The proctored assessments provide you with an opportunity to demonstrate your mastery of the course knowledge. You can find the information on how to take proctored assessments in the Taking Proctored Assessments section of the Syllabus.
The quizzes provide an opportunity to bolster knowledge from the readings and slides.