He made a few mistakes, but invaded Russia cant be consider has one.. he had no choice! Plus, he nearly conquer it. But IMO a little top 3.
1) He's treatment of the jews: He destroyed the Poland economy. Instead of becoming a source of wealth and power, it cost him... a lot. All the logistic of actually executing his racist policies drained ressources that didnt contribute to the war effort. It became a huge bullet to carry.
2) Keeping 3 fronts in Russia. When he was slowed/stopped at Moskow doorstep, his generals suggested to centralize his forces and finish off Moskow, cutting the head of the dragon. He decided to keep pushin on all front and then come Stalingrad.
3) Keeping a Hardline provocative tone with the British. It has been studied a lot that after the flash defeat of France, most political leaders in Britain were seriously considering allying themself with Hitler. They actually couldnt, mostly because the public opinion wasnt on their side. Hitler, instead of offering good term that would show respect AND a good share, choosed to use threats and later in september gave the order to bomb them into submission, Which is the stupidiest thing you can ever think to acheive. The worst part is that a lot of sources says that he never really intended to attack Britain who he considered has brothers (and also.. pityful pirates of a nation). More over, he knew he had NOTHING to gain by invading the british isle... at best he would have dismantle the empire without havin any mean of claiming it for himself.
1) He's treatment of the jews: He destroyed the Poland economy. Instead of becoming a source of wealth and power, it cost him... a lot. All the logistic of actually executing his racist policies drained ressources that didnt contribute to the war effort. It became a huge bullet to carry.
2) Keeping 3 fronts in Russia. When he was slowed/stopped at Moskow doorstep, his generals suggested to centralize his forces and finish off Moskow, cutting the head of the dragon. He decided to keep pushin on all front and then come Stalingrad.
3) Keeping a Hardline provocative tone with the British. It has been studied a lot that after the flash defeat of France, most political leaders in Britain were seriously considering allying themself with Hitler. They actually couldnt, mostly because the public opinion wasnt on their side. Hitler, instead of offering good term that would show respect AND a good share, choosed to use threats and later in september gave the order to bomb them into submission, Which is the stupidiest thing you can ever think to acheive. The worst part is that a lot of sources says that he never really intended to attack Britain who he considered has brothers (and also.. pityful pirates of a nation). More over, he knew he had NOTHING to gain by invading the british isle... at best he would have dismantle the empire without havin any mean of claiming it for himself.