Overview of nano's shortcuts        

The editor's keystrokes and their functions             


File handling
Ctrl+S   Save current file
Ctrl+OOffer to write file ("Save as")
Ctrl+RInsert a file into current one
Ctrl+XClose buffer, exit from nano

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

Search and replace
Ctrl+B    Start backward search
Ctrl+FStart forward search
Alt+BFind next occurrence backward
Alt+FFind next occurrence forward
Alt+RStart a replacing session

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

Operations
Ctrl+T   Execute some command
Ctrl+T Ctrl+SRun a spell check
Ctrl+T Ctrl+YRun a syntax check
Ctrl+T Ctrl+O  Run a formatter
TabIndent marked region
Shift+Tab   Unindent marked region
Ctrl+JJustify paragraph or region
Alt+JJustify entire buffer
Alt+TCut until end of buffer
Alt+:Start/stop recording of macro      
Alt+;Replay macro

Moving around
One character backward
One 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
Alt+Home  To first row in viewport
Alt+EndTo last row in viewport
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

Information
Ctrl+C   Report cursor position
Alt+DReport line/word/character counts
Ctrl+GDisplay help text

Various
Alt+A     Set or unset the mark
Alt+VEnter next keystroke verbatim
Alt+CTurn constant position info on/off
Alt+NTurn line numbers on/off
Alt+PTurn visible whitespace on/off
Alt+STurn softwrapping on/off
Alt+XHide/unhide the help lines
Alt+ZHide/unhide the info bars
Ctrl+LRefresh the screen