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You've probably seen these ones before. They might be for slideshows. They might be for implementing things like drag-and-drop and working with accordions. They could be as simple as a library that just helps you add curved corners to your divs. Now most of these libraries are open source and they are free. There is no licensing. You simply grab the code and use it, do whatever you want with it. So I encourage you to explore what's available, and new ones are appearing all the time.
Access exercise files from a button right under the course name.
Search within course videos and transcripts, and jump right to the results.
Remove icons showing you already watched videos if you want to start over.
Make the video wide, narrow, full-screen, or pop the player out of the page into its own window.
Click on text in the transcript to jump to that spot in the video. As the video plays, the relevant spot in the transcript will be highlighted.