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.