Taking the rook is a blunder because the queen to the c5 square is a checkmate. If you click the "show moves" button in that picture it'll show you the best continuation of moves for you and your opponent.
Why is this a blunder?
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Started playing chess about a month ago.
What am I missing? Why computer thinks that taking a figure with a pawn is a blunder? Why does it always want to sacrifice my queen?