Chess · Stage 1: Don't hang pieces
Take what is hanging
Most games between beginners are decided by a piece left where it can be taken for free. Learn to see those pieces, on both sides of the board.
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A piece is hanging when it can be taken for free. Either nothing defends it, or it is attacked more times than it is defended.
More practice, free: Hanging piece puzzles from real games, on Lichess.