Know the ins and outs of how knights fight against passed pawns. Knights can either blockade a passed pawn, or attack it, but not both! If you're trying to promote a pawn, see if you can deflect the enemy knight using your own knight as bait. Knights are also notoriously bad at dealing with passed rook pawns, as they have less room to maneuver.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown534"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "1k6/pp3r2/8/2Qp1r2/P7/1P1P1pp1/2P5/4KR2 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... f2+ ( { Black can try: } 1... g2 2. Qd6+ Kc8 3. Qe6+ Kd8 4. Kf2 gxf1=Q+ 5. Kxf1 f2 6. Qd6+ Ke8 7. Qb8+ Ke7 8. Qxb7+ Kf8 9. Qb8+ Kg7 10. Qg3+ { With a
likely draw. } ) 2. Ke2 g2 3. Rxf2 g1=Q 4. Qd6+ Kc8 5. Qe6+ Kc7 6. Rxf5 Qg4+ 7. Kd2 Qxf5 8. Qxf5 Rxf5 { Black wins with a large material advantage. } 0-1