1. His first mistake was during the battl of britain. Germany was doing a good job with britain. Believe it or not but I believe that If hitler kept on bombing the British airfields, runways , and factories, He would successfully destory Britain's accessibility of using aircraft as well as building more aircraft and weapons to fight Germany.If he kept on bombing those places he would definately have an easier time to attack London later on during the war. But as soon as the British mistakingly bombed Berlin Hitler became furious and demanded the bombings of London. With all the fighting concentrated in England, The british havemore time to stock up to defend. 2. Hitler attacked the U.S.S.R. to quickly . This forced him to fight on two fronts. Also, considering that Napolean didn't even conquer Russia due to the disastrous winter. Thats exactly what happened to the Germans.They even had to turn to Canibalism to survive. These are 2 crucial mistakes I believe Hitler made.