It defines what Marx implies and means by the word Communism. It also details how the Manifesto of the Communist party arose. This site presents a biography of Karl Marx. It defines what it meant by Marxism. It also gives specific quotes from Karl Marx about Socialism.
Several links deal with capitalism, the value concept, and use-value.
There is also a link about capitalism in general. This is a great site to look at if you have questions about value, capitalism, and commodity. Finally, the site illustrates Marx's theoretical contributions to sociology. The organization of these links follows George Ritzer's Classical Sociological Theory .