Positional Continuity in chess

In chess an important concept to learn is the idea of looking at how an opponent's move changes the nature of the position. In this game, White moved the Bishop from b2 to c1 and it is black to move

As black, you should ask "How did this bishop move change the nature of the position?" 
This may seem like a lot to think about every turn, but the more you do it the faster it gets and the easier it is to understand moves and positions. 

In this case, the nature of the position changed because the Bishop is now on an open diagonal and is able to form an attack on black's queen that's also occupying a dark square on h4. Black could then think "my queen is going to be attacked by the bishop moving to g5 (and would be defended by a knight), I need to prevent that". 

With that thought process in mind, it becomes a lot easier to find the best moves for this position which are the following:

Nd4, this attack's white's queen and gets the knight to a very strong outpost. If white still tries to attack black's queen, black can take the white queen with check, and after the king moves, black can sacrifice their knight next to their queen with another check Nxf2. This move would give the black queen a square to escape to. 

pawn to f6. This pawn move defends the g5 square and prevents the bishop's attempt at attacking the queen

Qe7. This gets the queen to somewhere where she can't be trapped. It might seem passive, but it's better than losing her.