YouTube enhancements features
Trimming the length of a video, adding interactive end screens, blurring faces and objects, and applying color filters are part of the YouTube enhancements features. You can finish it within YouTube.
iMovie & Story Mix
iOS and MacOS users have access to iMovie for free. This tool can be used on iPads or Macs.
Windows users can still use Windows Movie Maker, even on Windows 10 computers. Also later this year Microsoft will release a new tool called Story Mix, which is the replacement of Movie Maker.
Adobe Spark is free to use. It allows you record narration on a scene-by-scene basis after uploading images and videos. Working with Green Screen by Do Ink app, you could create a professional product.