If you haven’t checked it out already, I would highly recommend you watch @robertsyrett’s YouTube series called Know Your Nodes. You can search the playlist and watch them one after another.
The one I have included above is really informative, and he goes over some of the basics of FM, which I had some trouble reconciling initially. Maybe this will help you in your search?
If you haven’t seen them, they are all worth watching, as they are super well done and you will walk away feeling like you understand things a lot better.
Robert is not really one to self promote, but check out any of his videos on there, and you will gain a better understanding of whatever the topic happens to be. I hope this helps too!