If you had opened and read the TeX book, you'd understand it.
I could go on but what else in the world do I have to add to that so I can say "as for me, I opened the TeX book, read it, and understood it" or "I know how to use LaTeX, confidently"?
I don't know the answer to that question, but I do know the answer to the question "is TeX / LaTeX a well-designed, user-friendly, sane software?". The answer is no, no, and no.
Software should be invisible and not a hindrance to our ability to express ourselves.
I mourn for the time I wasted on Latex. For nothing.