Gush even more about Emacs

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+It is hard to put into words how much Emacs encroaches on my life.
+There are [[https://en.wikiquote.org/wiki/Emacs][very poetic quotes]] out there, e.g.
+
+#+attr_html: :cite https://en.wikiquote.org/wiki/Emacs
+#+begin_quote
+Emacs outshines all other editing software in approximately the same
+way that the noonday sun does the stars.  It is not just bigger and
+brighter; it simply makes everything else vanish.
+#+end_quote
+— Neal Stephenson, {{{cite(In the Beginning… was the Command Line)}}}
+
+Perhaps if I put enough miscellaneous trivia into this file, it will
+eventually grow into something that can justify this level of
+hyperbole.
+* Conventions
+** =RET= vs =C-j=
+:PROPERTIES:
+:CUSTOM_ID: convention/electric-indent
+:END:
+By default, Emacs turns on ~electric-indent-mode~, which, among other
+effects, sets down a convention that works across most modes:
+
+- =RET= is the "DWIM" binding that opens a new line at the "correct"
+  indentation level;
+- =C-j= is the simple binding that literally just inserts a newline.
+
+My (completely post-hoc) mnemonics for this is that =RET= is either
+
+- =C-m=: I rarely want to insert an actual /carriage return/; if I do
+  though, I can quote-insert it with =C-q C-m=, like other control
+  characters,
+- the =<retrun>= function key: it stands to reason that a "function
+  key" would do something "smart".
+
+While =C-j= is "literally byte 10, aka the newline character", i.e. a
+character that I will indeed write as-is in my files.
+
+(Pay no mind to ~lisp-interaction-mode~ aka =*scratch*= breaking this
+convention by binding =C-j= to ~eval-print-last-sexp~; we wouldn't want
+things to become /too/ consistent now would we 😀)
+* Third-party packages
+** Magit
+A bit unfair to lump Magit in "third-parties" given its popularity,
+and its fruitful secret life as "tarsius's personal Elisp mad lab".
+Some may call it "NIH syndrom", but I personally thank Jonas for
+pushing the boundaries of what Emacs can do, from UX (transient,
+magit-section) to DevEx (cond-let, llama).
+*** blame
+- =b= drills down recursively into the current chunk's history.  I
+  used to
+  1. blame,
+  2. land on an "uninteresting" commit (cleanup, refactoring),
+  3. =SPC= to get the revision buffer,
+  4. scroll to the relevant hunk,
+  5. =RET= on the corresponding removed line,
+  6. go to 1,
+  until I finally found the "interesting" commit; turns out =b=
+  automates all of this.
+*** diff buffers
+- =RET= vs =C-j=: I like that they follow what I think of as [[#convention/electric-indent]["the
+  electric-indent convention"]], i.e. "=RET= does something smart; =C-j=
+  stays dumb"
+  - =RET= visits DWIM read-only blobs:
+    - added or context line? current revision
+    - removed line? parent revision
+  - =C-j= visits the current worktree file