Learning Flysystem, or something that would work better for me

Thank you, that is very helpful.

Does that mean I should find a CDN, and I can learn from that CDN what I need from Flysystem? I thought differently, that I should learn Flysystem first, and then use it with almost any CDN. If I can do both, I’d prefer to do it the way I mentioned second.

I’m still very interested in answers to the following question, and learning about Flysystem from a print book.

Flysystem isn’t even in amazon.

I understood that I needed one of your three words with the word “Flysystem,” but I thought I also needed a third word. The third word would be the name of an advanced PHP technique. However, if I understand rpkamp correctly, I don’t need a third word, because Flysystem doesn’t require advanced PHP techniques. In addition to the three words you gave me, is there a fourth (or hopefully even more) that will result in (preferably print) books?