If you’re interested in the systems behind Apollo, go find and read “Digital Apollo”.
It goes all the way through the project and describes in good detail everything, how they developed the control systems, the computer hardware, how the software was designed, how they implemented one of the first real computer systems project management, all the interactions between astronauts/test pilots who still wanted to “manually fly the lander”, the political back and forth between competing teams, the whole thing.
It’s a great read if you have a technical mindset.
The problem with stack overflow is that you need to know enough about the domain you’re working in to describe it accurately enough to search and find that previous great answer.
If you have no clue, and then naively ask the no-clue kinds of questions, because you have no clue, then you get beaten over the head about not searching for the existing answer that you don’t know how to search for.