Ghost image in Docker on Mac

Okay, so I’m looking for a ‘Dummies’ guide to get my head around a few things in relation to Ghost.
First thing, and I think this is a very basic question but I can’t seem to find an answer, where are the installation files and site files stored for a ghost site?
For example, if I have a wordpress site and I upload an image to the site, I can locate that image file quite easily. Also theme files for a wordpress site are easy to find.
However, I can’t seem to find ANYTHING when I install Ghost either remotely or locally with Docker for instance?
So, simply put, if I’m running a local site in Docker where are all the site files stored? Where are the image files?
I’ve also installed Ghost on AWS on an UBUNTU instance but where are all the files?
Is it possible to view the files using Filezilla for instance?
I like the ghost platform but it seems like hard work to manage a site…

Relative to the directory where Ghost is installed:

Content/themes for the theme files (but note that source is a symlink -weird case).

Content/images for the images