# How best to read TeXBook? (obsoleted references in LaTeX2e) [closed]

Goal: Learn LaTeX2e completely.

I tried the TeXBook (or rather, got some of my team to try reading it). It's got a lot of obsoleted/removed references (`\tenrm`, for eg).

• TeX is not LaTeX. TeX is the language and LaTeX is a set of macros built on top of it. So `\tenrm` is not obsolete at all; it's just not defined in LaTeX but in the `plain` format for TeX. See e.g. What is the difference between TeX and LaTeX? for more information on the difference between TeX and LaTeX. – Alan Munn May 2 '18 at 3:39
• Note that LaTeX 3 is different and the tag is for questions specifically about stuff from the LaTeX 3 project, so not relevant here. `tex-core` is for core TeX stuff and not a suitable tag for a question about LaTeX (of any variety) or its relationship to TeX. I've used the `learning` tag instead, but I'm not sure that's the best choice. – cfr May 2 '18 at 3:56