Hmm.

As one area I'd say thet the Germans had to work out a strategy for dealing with Britain. Either strangle it with U-boats (cheap and pretty likely to succeed) or invade it with land forces (tricky but possible with enough preparation) or go for the peripheral strategy in the Mediterannean (equally possible with enough resources). At various times Hitler tried all of these, but none of them with any deep conviction until it was too late for any of them to succeed.

Jumbo

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"Capital! We're nearly out of ammunition! Now we can get at them with the bayonet!" General Paddy Gough, 1st Sikh War