Googling around for answers to Mac related problems, I can easily see that about half the people "answering" questions are completely clueless, just cargo-culti

Googling around for answers to Mac related problems, I can easily see that about half the people "answering" questions are completely clueless, just cargo-culting various voodoo stuff. I suspect that among the other half, half of those are equally clueless, but I can't tell which ones because I'm myself not mac-savvy enough! And Xcode itself does not help. I install Xcode. Well, actually, I didn't, because you need to actually start Xcode for it to completely install itself. It seems to come with a complete set of command-line tools; I can compile and run plain Unix stuff from the command line. Great. Except when you try to run Homebrew, that complains that you don’t have the True Command Line Tools; you need to run xcode-select --install to install what appears to be a completely different copy of the same things. Wtf?