(Very simply put) Germany was in a deep depression. The people where jobless and starving. I don't know about 3 things, but what he promised was no german will be of a lower class. He eliminated poverty for true german citizens by taking the rights and wealth away from all non germans. He made true on this promise and that's how he received the german's populations support
Before coming to power, Adolf Hitler promised the German people of good social status, stable economy and repossession of old lands/territories. He was able to make the German economy back to its feet again and recover most resources that were lost in World War I.