Socialism has always been socialism. Today there seems to be some who use it interchangeably with communism, but this is not the case. Both are two different "isms" and approach government in two different ways.
Yes, he started out as a Marxist, and the Fascism he later developed is simply socialism with nationalism. Hitler's national socialism is more to the point.
one of them is that workers should control the means of production.
Marxism
English Socialism
No, socialism is not a mistake. It is a post-capitalism or an alternative to capitalism that will emerge sooner or later when humanity moves beyond the need for a capitalist system.
KARL MARX had the view that history was inexorably trending to communism and that capitalism would improve to socialism and socialism would improve to communism.
national socialism
In 'The Communist Manifesto', Marx called upon the workers of all countries to unite. Once united, the workers would overthrow the owners and controllers of the means of production and by this revolt usher in an economic era of socialism, which would later evolve into communism.
No. He viewed what he called "utopian socialism" as too idealistic and impractical. He proposed scientific socialism instead, because he believed that socialism was the scientifically proven next stage of human economic development.
Socialism
Nazism or National Socialism
Communism