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And I'm too outdated to not know.
The blank screen, or "box" with the flashing text courser is a command prompt.
In "old school computing", pre windows like A-Basic & DOS, typed commands and text were used vs graphic menus (windows), that you then used "point and clicks" with.
A simple, powerful tool today. From being simple a short cut, to a complex programing tool, it does it a lot.
Commands prompts do(did) vary. So just be careful about "where" you are playing when throwing commands around. Make sure its the right command for that prompt.
The "windows key" + R should bring it up if the os is running.
It can be used to launch windows, if its there, but you will have to locate updated specifics
A full lists of OS commands can be found with a search (about 300 for windows).
Just reading them over quickly would help you get a better grasp of what I'm implying as well as what you can do with them.
Save some time and reload your old OS.
Unless you're strictly a social butterfly with a need of "less", and want something like on a cell phone, W-10 sucks. Nice on a phone maybe.
I'm going back to W-7 as soon as I copy some newer data and back up files.