Don't worry too much about what you don't understand, the truth is that at the current speed things are changing it won't matter in a couple years what you know now anyways.
Just keep reading and pick up what you can, and remember that just because you don't know how or why it works doesn't mean you can't make it work for you.
Eg: How many Uber drivers know how to fix a car? or How many social media stars know how to render a video, let alone what protocol is being used in the back end of the virtual server hosting it.
Back in the 70s and 80s computers were far less complex than they are now but only "smart" people knew how to use them....how did that work out for 99.9% of them?
Don't put too much value in the fact that these things are complicated right now as eventually they will get more complicated but easier to use, thus allowing the majority of non geniuses to take full advantage of the tech.