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 "Unknown206"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[ECO "A00"]
[FEN "8/8/8/2pk1ppp/P7/2P1K3/6PP/8 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. h4 gxh4 ( { Black can try: } 1... g4 2. Kf4 g3 3. Kxg3 Ke4 4. a5 Kd5 5. c4+ Kc6 6. Kf4 Kb7 7. Kxf5 Ka6 8. Kg5 Kxa5 9. Kxh5 Kb4 10. g4 Kxc4 11. g5 Kd4 12. g6 c4 13. g7 c3 14. g8=Q { White wins with a large material advantage. } ) 2. Kf4 Kc4 3. Kxf5 Kxc3 4. a5 c4 5. a6 Kb3 6. a7 c3 7. a8=Q { White wins with a
large material advantage. } 1-0