Heading levels could benefit from a review in the following activities.

• Feedback (h1 > h3)
• Forum (h1 > h3)
• Assignment grading (starts at h3, no h1 present)
• Assignment with grading summary (h1 > h3)
• Glossary (h1 > h4 for entry)
• Lesson (h1 > h3 for slide titles)
• Quizzes (h1 > h3 > h5)
• Book (h1 > h3 > h5)
• Wiki (h1 > h3)
• Workshop (h1 > h3)

Images attached. These were assessed using WAVE by WebAIM, a free accessibility evaluation tool.