What are black's main ideas within the QGD

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chillbro123

Hi, Im quite a low rated player, but since i've gotten past the 1000 mark I've been seeing a lot more queens gambit, so i've been trying out the QGD to try and combat that, however I still do not understand black's motifs and ideas in the QGD. One of the problems I get is after i develop my c pawn and knight below it I will often run into annoying positions where my knight is pinned by the bishop and several other pieces are attacking it with not much ways for me to defend it.

So, what are blacks long term plans and goals in the QGD, what do i do with my light square bishop, how do i develop my queen knight, and when do i push my c pawn