General

  • Ctrl+N new, Ctrl+O open, Ctrl+S save, Ctrl+P print;
  • Ctrl+C/V/X copy, paste, cut; Ctrl+Z undo, Ctrl+Y redo;
  • Ctrl+F find, Ctrl+H replace.

Writer

  • Ctrl+B/I/U bold, italic, underline;
  • Ctrl+E/L/R centre, left, right;
  • Ctrl+1/2/3 single, double, 1.5 line spacing;
  • Alt+Shift+D insert today date.

Spreadsheets

  • Ctrl+; date, Ctrl+Enter fill selection;
  • Ctrl+Shift+L filter, Ctrl+T table;
  • F4 repeat the last action (used even more than in Office).

Presentation

  • F5 present, Shift+F5 present from current slide;
  • Ctrl+M new slide, Ctrl+D duplicate slide.