To counter opinions said here: books like Capital, in the sense of being a text that goes as throughout as possible in the subject it adresses, are very much needed as so it is for all principled communists to read and understant them. Yes, they are dense and no one said it would be easy to go through them, but they are like this for a reason. The main target of condensed and simplified theory on the other hand should be people who are still on the fence about communism or who have crossed it very recently.

Edit: grammar.