The arch wiki is always a good place to look. There are a lot of introduction blog posts around that I have not read so cannot recommend - but plenty to look at if you need more information or a more beginner friendly guide than the arch wiki.
The freedesktop manuals are also worth a look at for more advanced stuff you can do with them - but are not really required for basic things. They just detail all the settings you have available and are much more of a reference than a guide.