The Pawn can only move forward. It never moves sideways or backwards. This means that each time a White Pawn moves, it advances toward Black's side of the chess board, and each time a Black Pawn moves, it advances toward White's side of the board.
The Pawn normally moves one square at a time, but there is a big exception to this rule. On its first move, when it is still sitting on the second row, it can move one or two squares. The green circles in the diagram show the two possible initial moves for the White Pawn and the two possible moves for the Black Pawn.
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