create note: right-click on canvas
change color: single-click note
edit note: double-click note
delete note: right-click note or drag to trash
draw lines: shift + drag from note to note
multiple select: ctrl/cmd + left-click note or click-drag on canvas to box-select notes
canvas mode: dashed square = select; hand = pan / swipe / pinch
pan canvas: scroll wheel, middle-drag, Pan mode drag, or space + drag
zoom: ctrl/cmd + scroll; Pan mode also supports two-finger pinch; fit view: F or ⊡ button