LearnersTV: This site provides free video and audio lectures of whole courses conducted by faculty from reputed universities around the world across many fields.
"Online software training videos that really work. Available 27/7.
› Learn software from Adobe, Apple, Microsoft and more.
› Classes for beginners to experts.
› Learn at your own pace: Play, pause, rewind.
› Watch one tutorial at a time, or a whole course."
There are some videos where all you need is a small portion. When I am designing Moodle courses, I will sometimes only need small parts of videos to embed. Welcome Tube Chop. Take the URL of the video you want to chop and trim both the beginning and end to what you need. You can then share it via a link or embed the chopped video on your site or page.