Shortcuts

Ctrl and Cmd both work.

KeyDoes
SpaceAdd a node
DeleteDelete
BackspaceDelete and reconnect
Ctrl+ZUndo
Ctrl+Y or Ctrl+Shift+ZRedo
Ctrl+C / Ctrl+VCopy / paste
Ctrl+ASelect all
FFrame everything
EscCancel

The browser keeps Ctrl+S, D, E and G, so save, duplicate, bypass and group are on the buttons and right-click menus.