On Tuesday, 13 Jun 2017 at 02:00, Birnle wrote:
> Which book (or books) do I have to read / work through to get from
> Emacs/Org novice to (almost) guru? Which is/are the best in your
> opinion?

Much of emacs, including the various subsystems (gnus, org, calc, ...)
is documented via the info system (C-h i) inside emacs.

[...]

> And is it necessary to learn Lisp in order to master Emacs?

Yes.

-- 
: Eric S Fraga (0xFFFCF67D), Emacs 26.0.50, Org release_9.0.7-531-g530113