Issues in your course accessibility report are ranked by priority, based on how many students are impacted, how often the issue occurs, and the content's accessibility score:
Severe: the greatest risk to accessibility; requires the most attention.
Major: impacts accessibility and requires attention, though not as urgent as severe.
Minor: worth addressing for a better score, but lower priority.
You can also choose to start with Content with the easiest issues to fix or Fix low scoring content, depending on how you'd rather work through your course.
For more information, visit Course Accessibility Report.