To quickly find videos with new comments in the course, the Course Videos table can be sorted by the "New Comments" column:
Click on the row of a video will open the Video View with the discussion. At the top of the Discussion a quick summary of the remaining comments to review can be found: 
Once the review is done: 
Not-reviewed comments (the ones you haven’t read yet) will be highlighted in yellow:
You can decide how you want to review the comments.
Comments can be:
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Manually reviewed - You can mark comments as read\ not-read:
You can also mark all comments as read with a single click:
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Automatically reviewed – Comments will be automatically marked as read after a few seconds:
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Sorted – You can choose the view of your comments:
Comments can be sorted by:
Not-reviewed comments might be at the last page, therefore if you are not using the sorting ability, it’s important to browse all the comments pages using the navigation bar at the bottom of the discussion: 
Video comments can be exported, by clicking on the export icon in the discussion.
Comments can be exported to a spreadsheet or a document! 
The export contains course and video information. All the comments are sorted by video time-tag and include common details such as author, date and sentiment.
The Activity Trends graph shows trends of key metrics over a period of time. It allows to investigate how the users learn over time and identify important events throughout the video life cycle.
The key metrics of the trends are: Engagement (blue), Collaboration (green), Notes(orange) and Views(red).