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Learn the skill
A knight moves two squares in one direction and one square at a right angle. It can jump over pieces, but cannot land on its own piece. A legal capture lands on an opponent's piece and removes that piece.
Worked example
From d4, a knight can reach b3: two files toward a, then one rank toward 1. It does not stop on either intermediate square. In the shown position, b3 is empty and the move leaves White's king safe, so it is legal.
White to Move
White has a king on a1, knight on d4 and pawns on e4 and e6. Black has a king on h8 and pawn on f5. All other squares are empty. The knight's eight possible L-shaped destinations are b3, b5, c2, c6, e2, e6, f3 and f5. Check what occupies each destination before deciding.