Various keyboard shortcuts are available to offer advanced features, or to make editing faster:
a: show guidelines to make right angles when drawingEnter: validate your drawingCtrl + z: cancel last editCtrl + Shift + z: restore last cancelled editDelete: delete selected featureCtrl + c: copy selected featureCtrl + v: paste copied featureCtrl + Shift + v: paste tags of copied feature on selected featureEsc: unselect selected feature