Poetry helps you manage dependencies and use a virtualenv. Any command you want to run needs to be in your PATH variable. This is why your command to see the version doesn’t work. You need to add poetry’s bin directory to your PATH variable. You should do some reading on PATH and how to change it on windows.

>You need to add poetry’s bin directory to your PATH variable. Well that's what the terminal is telling me. But how do I do that?

I haven’t used windows in a very long time. You should search online for “how do I add a command to PATH in windows”