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).

Or should I start with LateX Companion?

Do the LaTeX2e books omit concepts already covered (and still in use) by TeXBook? (That is, does reading just the LaTeX2e books let me learn all of LaTeX2e, including the parts that are inherited from TeX?)

Related to this question.

closed as too broad by Henri Menke, Bobyandbob, Troy, Phelype Oleinik, Stefan Pinnow May 2 '18 at 12:57

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    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
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    There's still a lot to be learned from the LaTeX Companion, but it's quite old now. A more recent book that covers a lot is Marc van Dongen's LaTeX and Friends. See What are good learning resources for a LaTeX beginner? for many more suggestions. – Alan Munn May 2 '18 at 3:42
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    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
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    You're asking a bunch of questions: (1) How best to read the TeXbook (2) Should I start with the LaTeX companion (3) Are the LaTeX2e books a superset of the TeXbook. The answer to (3) is No, but the answers to (1) and (2) depend on what you're reading it for, or what you need to do / what your goal is. Without that, this question is quite difficult to answer. – ShreevatsaR May 2 '18 at 3:59