Make sure to use your king! When all else is equal, the side with the more active king will get the upper hand. If you're unsure how to evaluate a knight endgame, try to see which king is closer to the center or queenside -- the closer king will be able to contribute to the action first.
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[Event "rated untimed match"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "Unknown"] [Black "Unknown305"] [Result "1-0"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "r2q2k1/pp4p1/5p1p/3nr3/3R4/3P2P1/PP3QBP/5RK1 w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. Re1 ( { White can try: } 1. Qf3 Qb6 2. Qf2 Ne3 3. Rd7 Nxf1 { Black wins with a large material advantage. } ) 1... Rxe1+ ( { Black can try: } 1... Rh5 2. g4 Rg5 3. h4 Re5 4. Rxe5 fxe5 5. Rxd5 { White wins with a large material advantage. } ) 2. Qxe1 Qb6 3. Bxd5+ Kh8 4. Qb4 Qxb4 5. Rxb4 { White wins with a large material advantage. } 1-0