Understanding and forking existing plugins

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I would like to create a plugin that works somewhere around the lines of renaming image files when they are uploaded to a product’s gallery or set as product image using variables that the user set. It’s to be used with WooCommerce.
I looked around and found some existing plugins that are close to what I want to create so I put up the project directory and I’ve been reading through the main code files. I know the basics of WordPress, PHP and generally how it works but it’s really overwhelming for me right now and some guidance is very much needed.
There is the main plugin php file then there is the classes folder with Admin\_Pages, Design\_Patterns, Options and more and a class-plugin-core.php file and there’s also a vendor folder with some names which I assume are libraries used in this plugin.
Right now first thing I’ve been doing is just going through the main plugin file and the class-plugin-core file in classes folder if I’m asking for too much if you could guide me to a resource that would have information on how to do this would appreciate very much🙌

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