There is a lot of great content on YouTube and Vimeo, but sometimes you only want a small segment of a clip to teach your point.
Before you start clipping
First, consider the legalities.Some creators do not mind you cutting up their clips, others will not allow it. You'll need to find videos that are licensed under Creative Commons for re-use. Here is some guidance from Youtube on what you can adapt and here are some guidelines from Vimeo.
Rule of thumb: If there is no mention of licensing and reuse alongside the video, consider the video not licensed for your edits.
Vibby lets you snip one or more pieces of a video from Vimeo, YouTube, and other hosting platforms.