Grading quick guide
From MoodleDocs
This guide is designed for teachers or non-editing teachers that will be entering grades for students. Grades can be entered in multiple locations in Moodle. It will depend on what you are grading where the best place is to enter the grades.
Grading from the Assignment page
If grading an assignment that has the student submit items to Moodle (file/online text etc.), the best place to enter grades is from the assignment itself.