Is there a web article that succinctly explains communism, socialism etc and why these are better for society?

Not really, most web articles are biased opinions, based on innuendos. Communism and Socialism are viewed by some unenlightened nations as evil words. These ignorant voices seem to have a lot of influence in their respective nations. Communism is the pinnacle of political evolution according to Marx. Also he claims there have never been any true Communist 'states'.