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 "Unknown375"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/8/5pp1/3k1p2/2p4P/2P1KPP1/8/8 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Kf4 ( { White can try: } 1. f4 Kc5 2. g4 fxg4 3. f5 Kd6 4. fxg6 Ke7 5. Ke4 f5+ 6. Kd4 g3 7. Ke3 f4+ 8. Kf3 Kf6 9. h5 Kg7 10. Kg2 { Draw. Neither side can
make progress. } ) ( { White can also try: } 1. g4 g5 2. h5 f4+ 3. Kd2 Ke6 4. Kc2 Kf7 5. Kb2 Kg7 6. Ka3 f5 7. gxf5 g4 8. fxg4 f3 9. Kb4 f2 10. Kxc4 f1=Q+ { Black wins with a large material advantage. } ) 1... Ke6 2. g4 fxg4 3. fxg4 Ke7 4. Ke4 Ke6 5. Kd4 f5 6. gxf5+ gxf5 7. Kxc4 f4 8. Kd3 Kf5 9. c4 Kg4 10. Ke2 Kxh4 11. c5 Kg3 12. Kf1 f3 13. c6 Kf4 14. c7 Ke5 15. c8=Q { White wins with a large
material advantage. } 1-0