Tools
VSelectHPan (or hold Space)
RRectangle — drag to drawOEllipse
LLineYTriangleSStarTText — click to place
Shiftwhile drawing: square / circle
Editing
Clickpick the smallest part under the cursor
Alt Clickpick its whole group
Shift Dragmove on whole numbers
← ↑ → ↓nudge 1, with Shift 10
Drag a labelscrub the number left / right
Ctrl DduplicateDeldelete
Ctrl Ggroup, add Shift to ungroup
[ ]send backward / bring forward
Ctrl Zundo, add Shift to redo
Ffit to screenEscdeselect
Ctrl Vpaste SVG code to open it