• Ctrl + s -> Save
  • Ctrl + z -> Undo
  • Ctrl + Shift + z -> Redo
  • Ctrl + a -> Select all
  • Arrow keys -> Move elements by 1 px
  • Shift + Arrow keys -> Move elements by 10 px
  • Ctrl + g -> Group selected elements
  • Ctrl + Shift + g -> Ungroup slected group
  • Ctrl + c -> Copy element
  • Ctrl + v -> Paste element
  • Ctrl + Shift + v -> Paste element in place

If you hold down the CTRL key, you can select an upper layer