Napkin

Keys

Left-click: draw — places a point and keeps chaining members, snapping to nearby nodes
Right-click: inspect — opens the menus and fills the properties panel
Drag a box: select several members and nodes at once, with either button. Drag rightwards for a window — only what the box wholly encloses, drawn solid — and leftwards for a crossing — everything it touches, drawn dashed. AutoCAD's rule
The + on a node: right over a node, a green + offers to start a line from it; click to draw. It is what a click on a node means, so a joint no longer takes a hinge you did not ask for — Tab steps past it to the release
Delete: remove the selection, or whatever is under the cursor
Space / Enter / Esc: stop drawing — Space on its own returns to the Sketch tab
Shift: lock to orthogonal while drawing
Tracking: a point snaps onto the line through any other point, with a dashed trace back
Type a length: Tab switches to the angle; Enter accepts. In imperial 12'6", 12-6, 150" and 6 1/2" all work
Tab: step through everything a click could mean right now: whatever is piled up under the cursor — two squares beside the pointer mean there is more than one — and then the suggestions standing beside it
W: match properties — pick a member, then click as many others as you like and each takes its section. The source is the member under the cursor or the one selected; with neither, the first click picks it. Esc, Enter, W again or a right click finishes
C: copy the selection — click the point to measure from and the point to measure to, and it is laid down again at that distance. While the second point is being asked for nothing else is offered: the point snaps to nodes, to the members' own axes and square to them, and to whatever it lines up with. Esc, Enter, C again or a right click finishes
x5 · /5: once a copy is down, x5 repeats that distance five times over and /5 divides it into five equal steps. Retype it as often as you like — the array is rebuilt each time, and the whole of it is one undo
Gold flash: a member goes gold for a second whenever its section changes, however you changed it
Ctrl-Z: undo the last command
Scroll: zoom
Scroll over a load: its magnitude — a trapezoid takes each side separately, chosen by where along the member you are
Ctrl-scroll: scale every load, reaction and diagram up or down
Shift-scroll: cycle the support, load shape or section pictogram under the cursor, or the live suggestion
Alt-Shift-scroll: cycle a load's direction: perpendicular, vertical, projected
Right-click a node: choose its support; the panel holds its position and point loads
Right-click a member: choose material, then size; the panel lists its loads
The four pictograms: they sit on the member: material, grade, section and size (timber reads material, product, grade, size)
Near a member end: a release is offered: a circle for a hinge, two bars across the member for shear, two along it for axial. Shift-scroll picks which, Delete puts it back
Right-click a load: edit its shape, direction, side, magnitudes and the stretch it covers
Drag a grip: a selected load's magnitude, one at a time, square to the member only
Drag: move a member, or one end by its node
Middle-drag: pan
Alt: ignore snapping and tracking
A S D F: axial, shear, moment, deflection — a diagram tab hides the loads, shows the reactions, and locks the loading