WeVideo is a fully online program has comparable functionality to iMovie, VideoPad, or Shotcut.  Since it is web-based, you can use it on any browser, and it features iOS and Android apps that afford seamless editing on the same project across devices.  The drawback:  WeVideo is primarily a paid service, with subscriptions ranging from $5-$16/month.  The good news is that there is a free version that allows you 5 minutes of publishing time a month, but there is a large WeVideo watermark in the upper right corner of the screen.  WeVideo also has classroom and school subscription options, so it is possible that your school could adopt it.

If you’re using WeVideo for your project, get help by visiting WeVideo’s great support page.  Here you will find lots of video and text-image tutorials that will help you learn whatever you need to for your project.