What's the point of pushing the rook's pawn up one? It's in a lot

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What's the point of pushing the rook's pawn up one? It's in a lot of chess courses and I oftentimes see it in games. Don't understand why it's a good move. : r/chessbeginners

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If you don't have any extra Queen pieces available, what do you use to indicate Pawn promotion? - Quora

When 'pushing pawns,' is it better to capture chess pieces toward the edge or the center? - Quora

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