references/emacs.txt

C-u C-<Space>   goto last mark
M-!             execute shell command
C-u M-!         insert output of shell command at point
M-&             execute shell command async
M-|             execute shell command on region

you can type some code (like python or bash), select it, then invoke 
C-u M-| (shell-command-on-region) and it will replace with output!!!

C-h w           look up key bound to function
C-x z [z z z]   repeat, like . in vim

M-x rgrep       holy damn!

C-c C-.         org insert src block

C-c c           [CUST] notate key

M-/ 		hippie-expand
M-z		zap-to-char

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ORG MODE

    agenda

C-c C-s         schedule org item
S-f             follow mode


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FRAMES

C-x 5 2		new frame
C-x 5 o		other frame

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ELISP

C-u C-x C-e	insert eval results at point

(message "yo")
(buffer-name)
(buffer-file-name)
(switch-to-buffer (other-buffer)) ;; for humans
(set-buffer (other-buffer))	  ;; for computer
(buffer-size)
(point) (point-min) (point-max)
(interactive) opts: b"existing buffer", f"existing file",
	      	    p"numeric prefix"

(save-restriction
  BODY... )		;; undo any narrowing in BODY

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Plugins

; workgroups.el


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INFO

[, ]	prev, next node
l, r	back, forward in history
n, p	next, previous node
u  	up one level
SPC	one screen forward
TAB	links
m	prompt menu item

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HELP

C-h a	apropos (try: -word$)
C-h m	describe-mode
C-h f	describe-function
C-h k	describe-key
C-h v	describe-variable
C-h c	help -- keystrokes
M-. 	xref-find-definitions

M-x info-apropos

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MOVEMENT

M-r		reposition point
C-l		adjust window
C-M-l		reposition window
M-g M-g		goto line
M-g <tab>	goto column

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WINDOWS

C-x 4 C-f	find file, other window
C-x 4 d		dired, other window
C-x 4 b		switch buffer, other window, make active

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BOOKMARKS

C-x r m		set bookmark
C-x r l		list bookmarks
C-x r b		jump to bookmark

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REGISTERS

C-x r n		store number in register
C-x r s		store region in register
C-x r SPC	store point in register
C-x r j		jump to register
C-x r i		insert content in register

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KEYBOARD MACROS

<f3>		start recording
<f4>		stop recording/play macro

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RECURSIVE EDITING

C-r		enter
C-M-c		exit

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NARROWING

C-x n n		narrow
C-x n w		widen