This page provides some simple tools for video editing.
Windows 10 Movie Editor (Windows 10)
Windows 10 has a Video Editor application. It should be pre-downloaded in your Windows 10 or is available for free from the Microsoft Store if not. This software is simple but limited. It is useful for trimming videos, cutting out sections from clips, and combining many clips together.
Here is a guide on how to use it from the Academic Continuity Guidance support page: 6. Editing Video in Windows Video Editor
Microsoft Guide: https://support.microsoft.com/en-us/help/17205/windows-10-create-films-with-video-editor
iMove (Mac, iPhone & iPad)
Apple devices have iMovie as an option either installed by default or available via the App Stores.
DaVinci Resolve (Multiple Platforms)
This has been recommended by a member of staff at the University, DaVinci Resolve (https://www.blackmagicdesign.com/uk/products/davinciresolve/) as a very powerful and free editing option (but this would appear to be at the higher end of the spectrum)