Trumpf Sheetmetal Working Guides
Trumpf "Operator's Instructions on Universal Sheet Metal Working Machines" and "Trumpf Machines for economical Sheetmetal Working" Both these publications give an excellent overall view of how to tackle: Nibbling, Punching, Shearing, Slotting, Louver Cutting, Beading, Folding, Flanging and Peening (Dishing) operations.