When I dived into Python, I went through the beginner's tutorials. Of course, these tutorials cover only the basics and present only a shallow exhibition of what I can do with Python.
Right now I'm going through Getting to grips with LaTeX by Andrew Roberts. After this, I will want to see a complete LaTeX reference. For Python, I can immediately go to http://docs.python.org, then I am presented with a host of comprehensive documents about the Python standard core.
Is there a similar site for the LaTeX core? Something that I can "keep under my pillow", like The Python Standard Library? I want to be well-versed with the standard installation first (I have MikTeX) before I go out and use additional packages.