I recently finished reading The TeXbook and TeX by Topic. Now I want to understand more about the LaTeX or ConTeXt formats, as well as the more modern engines; things like:
- How does LaTeX2e / LaTeX3 work?
- What do engines like pdfTeX, XeTeX, and LuaTeX do behind the back?
- What is TikZ / PGF (or any other large LaTeX packages / classes)?
- What are the 'new' primitives such as
Obviously, the raw code is always there for me to read, but pointers to sources like books or documented sources / implementation notes (?) would be helpful. I found
source3.pdf for LaTeX but not for the others yet.