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Free online video editing classes aimed at putting content on social media platforms
Very beginner level basics
Stuff like converting video files into different formats and choosing the proper format
Combining sections of different videos and removing sections from videos
Putting audio into video files or removing audio from video files
Or turning a video file into a pure audio file
Stuff that should run with free software or through use of websites with chromebook
Suggestions
That stuff is pretty self explanatory in most editors.
But when it comes to transcoding you should recommend a program that can be instructed to use target file sizes.