nano editor usage

"^" represent Ctrl
symble "M" means Alt or Esc

^G (F1) Display this help text
^X (F2) Close the current file buffer / Exit from nano
^O (F3) Write the current file to disk
^J (F4) Justify the current paragraph

^R (F5) Insert another file into cursor position of the current one
^W (F6) Search for a string or a regular expression,the first time appear
^Y (F7) Go to previous screen
^V (F8) Go to next screen

^K (F9) Cut the current line and store it in the cutbuffer
M-6 Copy the current line and store it in the cutbuffer
^U (F10) Uncut from the cutbuffer into the current line
^C (F11) Display the position of the cursor
^T (F12) Invoke the spell checker, if available

M-\ (M-|) Go to the first line of the file
M-/ (M-?) Go to the last line of the file

M-G Go to line and column number
M-R Replace a string or a regular expression
M-A Mark text at the cursor position
M-W (F16) Repeat last search one by one if other text match

M-} Indent the current line
M-{ Unindent the current line
^F Go forward one character
^B Go back one character
^Space Go forward one word
M-Space Go back one word
^P Go to previous line
^N Go to next line

^A Go to beginning of current line
^E Go to end of current line
M-( (M-9) Go to beginning of paragraph; then of previous paragraph
M-) (M-0) Go just beyond end of paragraph; then of next paragraph
M-] Go to the matching bracket
M-- (M-_) Scroll up one line without scrolling the cursor
M-+ (M-=) Scroll down one line without scrolling the cursor
M-< (M-,) Switch to the previous file buffer
M-> (M-.) Switch to the next file buffer

M-V Insert the next keystroke verbatim
^I Insert a tab at the cursor position
^M Insert a newline at the cursor position
^D Delete the character under the cursor
^H Delete the character to the left of the cursor
Esc-T Cut from the cursor position to the end of the file

M-J Justify the entire file
M-D Count the number of words, lines, and characters
^L Refresh (redraw) the current screen
^Z Suspend the editor (if suspend is enabled)

(M-X) Help mode enable/disable
(M-C) Constant cursor position display enable/disable
(M-O) Use of one more line for editing enable/disable
(M-S) Smooth scrolling enable/disable
(M-P) Whitespace display enable/disable
(M-Y) Color syntax highlighting enable/disable
(M-H) Smart home key enable/disable
(M-I) Auto indent enable/disable
(M-K) Cut to end enable/disable
(M-L) Long line wrapping enable/disable
(M-Q) Conversion of typed tabs to spaces enable/disable
(M-B) Backup files enable/disable
(M-F) Multiple file buffers enable/disable
(M-M) Mouse support enable/disable
(M-N) No conversion from DOS/Mac format enable/disable
(M-Z) Suspension enable/disable
(M-$) Soft line wrapping enable/disable