You are White in the position below. Get some practical chess training and win this game. You have a winning advantage of 5 Pawns in this endgame. White has managed to "win the exchange" and has now rook for knight.
The rook is much stronger than the knight in this open position. The rook can penetrate into the black position through the open e-file. After this it can attack any weak black pawns from behind the lines.
The knight is too slow and will be unable to protect all weak spots and finally it will run out of steam and the rook will win another pawn. After this the game will be hopelessly lost for Black.
Go ahead and win now...I wish you good luck.