how to display plot images outside of jupyter notebook?
You can try to run an matplotlib example code with python console or ipython console. They will show you a window with your plot. 
Also, you can use Spyder instead of those consoles. It is free, and works well with python libraries for data science. Of course, you can check your plots in Spyder.
So, this might be an utterly dumb question, but I have just started working with python and it's data science libs, and I would like to see seaborn plots displayed, but I prefer to work with editors I have experience with, like VS Code or PyCharm instead of Jupyter notebook. Of course, when I run the python code, the console does not display the plots as those are images. So how do I get to display and see the plots when not using jupyter?