Overview of nano's shortcuts      

The editor's keystrokes and their functions         

File handling
Ctrl+S   Save current file
Ctrl+O Offer to write file ("Save as")
Ctrl+R Insert a file into current one
Ctrl+X Close buffer, exit from nano

Ctrl+K   Cut current line into cutbuffer
Alt+6Copy current line into cutbuffer
Ctrl+UPaste contents of cutbuffer
Alt+TCut until end of buffer
Ctrl+]Complete current word
Alt+3Comment/uncomment line/region
Alt+UUndo last action
Alt+ERedo last undone action

Search and replace
Ctrl+Q   Start backward search
Ctrl+WStart forward search
Alt+QFind next occurrence backward
Alt+WFind next occurrence forward
Alt+RStart a replacing session

Ctrl+HDelete character before cursor      
Ctrl+DDelete character under cursor
Ctrl+Shift+Del   Delete word to the left
Ctrl+DelDelete word to the right
Alt+DelDelete current line

Ctrl+T   Run a spell check
Ctrl+JJustify paragraph or region
Alt+JJustify entire buffer
Alt+BRun a syntax check
Alt+:Start/stop recording of macro
Alt+;Replay macro

Moving around
Ctrl+B   One character backward
Ctrl+FOne character forward
Ctrl+⯇One word backward
Ctrl+⯈One word forward
Ctrl+ATo start of line
Ctrl+ETo end of line
Ctrl+POne line up
Ctrl+NOne line down
Ctrl+⯅To previous block
Ctrl+⯆To next block
Ctrl+YOne page up
Ctrl+VOne page down
Alt+\To top of buffer
Alt+/To end of buffer

Special movement
Alt+G   Go to specified line
Alt+]Go to complementary bracket
Alt+⯅Scroll viewport up
Alt+⯆Scroll viewport down
Alt+<Switch to preceding buffer
Alt+>Switch to succeeding buffer

Ctrl+C   Report cursor position
Alt+DReport word/line/char count
Ctrl+GDisplay help text

Alt+ATurn the mark on/off
TabIndent marked region
Shift+Tab   Unindent marked region
Alt+PTurn visible whitespace on/off
Alt+VEnter next keystroke verbatim
Ctrl+LRefresh the screen
Ctrl+ZSuspend nano