Power can be good, and bad because with power comes responsibility. Hitler's power was good for him because he could take ahold of his dreams for world domination. People can get power through numbers, organization, and resources. They can excersize this power through force, influence, and authority.
Hitler had power through numbers. He excersized his power through influence. He gained people's support throughout his many speeches he gave, and the way he told them that he could solve all of their poverty and economic problems. He had power over all of Germany, and all the people living there. With this power he had to take care of a country and try to do what is best for them. He gained power by slowly advancing into leadership of the government. He could have gained more power by slowly taking over his surrounding countries. He tried to gain world dominance too fast. Hitler probably could have done it if he would have taken his time. Hitler could have lost more of his power if he hadn't waited as long to gain control over the government. No one had power over this authority until the other countries conquered against his armies in the World War II.