The Gradebook feature consolidates grade scores set up for assignments, quizzes, and other activities in a variety of grading methods. Each activity has its own grading criteria which can be different from one to the next.
Start by creating your assignments, quizzes, and activities you intend to grade. Set up your grading options (usually in the Grade section for settings). Activities with grading options set up are considered grade items and will be included in the gradebook and in calculations for course final grade unless other settings exclude the grade.
See the blue question marks 
on the setup screens and the Related Articles below for help with setting up grades and using the gradebook.
For further help, contact your college consultant.