Capturing
Taking a piece
Move onto its square. Your piece stays; the captured one leaves the board.
What the pieces are worth
13359
A guide for trades: pawn 1, knight 3, bishop 3, rook 5, queen 9.
The king has no number: it is never traded, and losing it loses the game.
The values are a guide, not a rule. A well-placed knight can be worth more than a rook that has nothing to do.