...
Letter - Assignment is graded by selecting a letter grade from a dropdown.
Numeric - Assignment is graded by entering numerals.
Free Form - Assignment is graded by entering any text. Free form assignments are not included in grade calculations.
Using Submission Grades
See Adding a Submission.
Approving Grades
By default, only approved grades are displayed to students and only approved grades are counted in Course Grade calculation (this can be changed via Settings). There are three ways to approve grades:
...