Tab - Open the nodes menu
Cmd/Ctrl + C / Cmd/Ctrl + V - Copy / Paste
Cmd/Ctrl + D - Duplicate selected node(s)
Cmd/Ctrl + Z / Cmd/Ctrl + Shift + Z - Undo / Redo
Cmd/Ctrl + P - Create a new Prompt node
Drag a wire + hold Option/Alt - Open node suggestions on drop and automatically connect the selected node
V / H - Switch between Select and Hand tools
Cmd + I - Import files