1 Not murder and torture the Jews, who of course resisted both actively and passively, as well as working much much less efficiently from being starved and freezing and beaten, than they would have well fed and rested and warm. So they should have kept them warm, rested them like you would any work animal (if you have any sense), and had had sufficient nutrition. Then the Jews could have manned munitions factories and worked speedily and as efficiently as Rosie the Riveter did in the US. This would have had the additional benefit of slowing Jewish agitation overseas about the Holocaust. Many Jews volunteered to fight Germany because their relatives were being slaughtered, as well as many German-speaking Jews becoming actively involved in espionage against Germany, even returning as extremely effective secret agents because they were native German speakers. There would have been far less of that if the Jews had not been mistreated. 2 Consolidating territories as they took them, instead of leaving rebel groups within the Reich to attack very effectively with sabotage and murder of German personnel, as the French Resistance did in France, and as other groups did as in Poland, et Cetera. The Germans should have secured the loyalty of the their new subjects or citizens or else NOT let them run around loose to commit sabotage and even fight the Germans in their countries. Those conquered peoples not fully and enthusiastically assimilated to the vision of the Third Reich were very pouty and truculent, and that should have been enough of a warning sign to become classified as "Nacht und Nebel" --id est, sent to concentration camps--rather than to have been allowed to run free as the French resistance were. 3 They should have clothed their troops in Russia warmly. Hitler had an INSANE notion that White men evolved in the cold, and that therefore they could endure the extreme cold in Russia without proper gear. His officers begged him to listen to them but Hitler would not, even to a Quartermaster like Hans-Georg von Altenstadt--author of "Unser Weg Zur Meer". 26 times his own officers attempted to assassinate Hitler for this insane policy of leaving men in the freezing cold, which did NOT regenerate them but only damaged them, and although he survived all 26 attempts, Hitler never was shaken into listening to them.