Flowcharts

Quick actions → Flowchart. Write one step per line, use -> for arrows, and “Is it paid? yes: Ship it, no: Send a reminder” for decisions. Or describe it and press Plan it.
Drag any step: the arrows follow. Tab adds the next step below the selected one.
Shift-click two steps to Connect them, or to Label, Reverse or Disconnect their arrow. Tidy lays it all out again.

More about diagrams