Sherry -- In Windows, use the "Video Editor" program that comes free with the operating system; it's by far the simplest. You can trim the video with that. You can also add text, titles, etc. However, its very limited functionality will not allow you to crop (perform a spatial reduction); it can only trim (perform a temporal reduction). But there are plenty of other kinds of software out there that can accomplish cropping as well as trimming.
I like to use the "VLC Media Player," which is free, and it runs in Windows 10, Mac OS, Android, etc. It plays videos, allows you to change the video format, trim, crop, and more. Get it here: https://www.videolan.org/
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