If you have found/made a video for your course, and you need to edit it; perhaps delete some parts of it or add a few slides in between to provide further explanations for your students, then we can tell you about openshot. A great video-editing tool.
Here is a clip that our colleagues in the library have made. You see instructions on how to use Open shot.
Openshot is a free tool. You can download and install it on your computer through this link. https://www.openshot.org/nl/