add cube (Z+ only)
click OR tap (in any view; right next to the grid grows it)
remove cube
shift + click OR right-click OR touch long-press
see x, y, z & stack count
hover with the mouse
save model
ctrl + s (⌘ on a Mac)
orbit (spin)
left-drag OR Shift + arrow keys
pan (move)
right-drag OR arrow keys
zoom
mousewheel OR pinch OR +/-
alt + ↑/→: zoom in
alt + ↓/←: zoom out