So I play a lot of Queen's Gambit Declined games as White and Black and I've noticed that in many games, one of the weak squares for Black becomes c6, especially when there is not a closed center to play against. What are some ways that Black can deal with this, or should he not focus so much on White moving to exploit this square and focus on either a minority attack or playing in the center, perhaps even contesting for control on the King's wing of the board. Any ideas?