Emacs/Help

All of Emacs's help is under C-h by default.

C-h C-h (Control-H, pressed twice) brings up the menu, most useful ones are in bold.

For example, to figure out what a key does, press C-h k (key combination).

Key	Description
a PATTERN	command-apropos. Give a substring, and see a list of commands (functions interactively callable) that contain that substring. See also the apropos command.
b	describe-bindings. Display table of all key bindings.
c KEYS	describe-key-briefly. Type a command key sequence; it prints the function name that sequence runs.
C PATTERN	describe-coding-system. This describes either a specific coding system (if you type its name) or the coding systems currently in use (if you type just RET).
d PATTERN	Show a list of functions, variables, and other items whose documentation matches the PATTERN (a list of words or a regexp).
e	Go to the Messages buffer which logs echo-area messages.
f FUNCTION	describe-function. Type a function name and get documentation of it.
F COMMAND	Display the frequently asked questions file.
g	Display information about the GNU project.
h	Display the HELLO file which illustrates various scripts.
i	info. The info documentation reader. This is where the Emacs manual is.
I METHOD	describe-input-method. Describe a specific input method (if you type its name) or the current input method (if you type just RET).
k KEYS	describe-key. Type a command key sequence; it displays the full documentation.
K KEYS	Show the Emacs manual’s section for the command bound to KEYS.
l	view-lossage. Show last 300 characters you typed.
L	describe-language-environment. This describes either a specific language environment (if you type its name) or the current language environment (if you type just RET).
m	describe-mode. Print documentation of current minor modes, and the current major mode, including their special commands.
n	view-emacs-news. Display news of recent Emacs changes.
p	finder-by-keyword. Find packages matching a given topic keyword.
s	describe-syntax. Display contents of syntax table, plus explanations.
t	help-with-tutorial. Select the Emacs learn-by-doing tutorial.
v VARIABLE	describe-variable. Type name of a variable; it displays the variable's documentation and value.
w COMMAND	where-is. Type command name; it prints which keystrokes invoke that command.
C-a	Information about Emacs.
C-c	Emacs copying permission (GNU General Public License).
C-d	Instructions for debugging GNU Emacs.
C-e	External packages and information about Emacs.
C-f	Emacs FAQ.

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