There are official docs:
much of which you can access through the command line once you get comfortable. They make it seem a lot more complicated than it is, though. For the basics (all most people ever need), see my post here:
A quick way to install XQuartz is with homebrew via homebrew cask . The advantage of homebrew is that it's a full-on package manager, so it not only makes it easy to install things all in one place, but also makes it easy to keep them updated. And let's face it: Unless it's really easy, there's no way any of us will possibly keep git or curl or other things that don't self-update up-to-date, and for the sake of security we usually should.
If you're just getting started with homebrew, install it by copying the terminal command in the first link above. (It runs a script from the internet, so I won't copy it here so you at least know you're getting it from the source.) Once homebrew is installe…
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