How to open the Unreal Engine 4 graphics code and what does it consist of?

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I say right away that I am a layman in programming, so far I know only cycles, conditions, arrays, a couple of operators and other trifles, but it's a matter of time. I don’t know how to work with libraries, I haven’t started OOP (Object-Oriented Programming) as such yet. So do not be surprised if the very details of the question seem incomprehensible or absurd to you. I decided to get acquainted with the "serious" code as part of the training, and in general the topic of graphics is very attractive.
I've been wondering for a long time, but I can't get my hands on it. Here, I decided to ask those who are more or less erudite in this topic.
* How to open the UE4 graphics engine?
* What does it consist of?
* Are there any books on the structure of the engine?
* How good is math?

Answer 1

Sources here
You want to start too cool, this engine is very large and complex. I advise you to start with the basics of graphics and programming at a more advanced level to study. Mathematics is very necessary, and also spatial geometry.
This series of articles can serve as a good starting point: https://habr.com/post/248153/