Pan: Hold Right Mouse Button or use 2 Fingers or buttons.
Zoom: Press +/- or i/o, spread/pinch Fingers.
Select Mode: Click path to select it, Shift+Click to select/deselect from group.
Movement: Drag the Cross over selected paths.
Rotation: Drag the Circled X over selected paths.
Re-select to reset selected paths pivot.
Hold Ctrl (or Cmd) and drag a Circled X to move the pivot.
White Squares = Anchor.
Red Circles = Control Handles.
Drag Control Handles to curve paths.
Hold Ctrl (or Cmd) to snap Control Handles or Circled X to multiples of 5.
Hold Ctrl (or Cmd) to and Click an Anchor to delete it.
D or Ctrl+D duplicates the selected paths in place.
Press Delete or Backspace to delete selected paths.
Press H or V to flip selected paths horizontally or vertically, respectfully.
Double-click or Ctrl+Click an Anchor to delete it.
Double-click path to add an Anchor there.
Snap: As long as snapping is enabled dragging Anchor or drawing snaps to the nearest Anchor/path.
Close: Select a path and either click Close / Merge or drag its start to its end. (this adds Control Handles)
Merge: Select multiple paths and click Close / Merge to unify them into a single one.
Trace: Select a color in the reference to make a path containing it.