As Spider-Man defeats enemies, he is given skill points which can be used to purchased boosted stats and new moves. These are separate for each costume. In general, red focuses on agility and black on brutality. In order to purchase moves you must have not only the necessary points, but sufficient reputation. Throughout Spider-Man - Web of Shadows, you have conversations with other characters where you are given red, black or neutral choices. Answering red or black will build that suit's reputation, as will various other actions throughout the game.
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