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 "Unknown276"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "3r2K1/7P/8/6P1/8/3k4/8/8 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Kf7 ( { White can try: } 1. Kg7 Ke4 2. g6 Kf5 3. Kh6 Kf6 4. g7 Rd1 5. g8=N+ Kf7 6. h8=Q Rh1+ 7. Kg5 Rxh8 8. Nf6 { With a likely draw. } ) 1... Ke4 2. g6 Kf5 3. g7 Rd7+ 4. Kf8 Kf6 5. g8=N+ Kg6 6. h8=Q { White wins with a large material
advantage. } 1-0