All of Emacs's help is under C-h by default.
C-h C-h (Control-H, pressed twice) brings up the menu, the 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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