A great tool for educators is Kapwing. Among the different features that Kapwing offers - from adding sounds to videos to video collage, my favourite is the online video trimmer. You can choose the video you wish to use for lessons and cut out any additional advertising or inappropriate content.
Here is an example on conference calls:
Kapwing is free and you can sign up with your Google or Facebook account. If you would like to have the watermark removed, then there is a small charge of $2, or if $10 per month for creating as many videos you like every month.
What other video editing tools have you found useful lately?