Suppose I want to learn TeX. Then, is The TeXBook a complete source? Does it cover all relevant aspect of TeX? Or is there something worth learning about TeX which is not present there?
Does also "TeX programming" appear there?
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The TeXbook is only about
It says nothing, for example, about the LaTeX or ConTeXt formats, nor about more modern engines like pdfTeX, XeTeX, LuaTeX… (Nota Bene: To be allowed to exist, all those evolutions had to be named differently than TeX and/or Plain TeX.)
It remains a very useful reading if you want to learn more about how things are made at the lower levels.