Everything you must know to master your queen vs. rook endgames

Queen versus rook endgames are tough especially if you are the rook. Today, I will give you some tips for 150-1300 elo. What can you do wrong in queen versus rook endgames? The answer is more that you think. In these endgames the most losing position when you are the QUEEN is the rook pinning the king to the queen for example take the position below:

Also, one more of the common mistakes if you are the ROOK is a fork. You better don't get stumped with this or you are going to lose. Take the position below again. 

You probably saw how bad it was for black to lose that rook. The third mistake is a king in the corner. Kings in a corner are very weak and even weaker if you are the rook. Take the position below what do you notice? White's king is trapped in the corner.