Learns to lose a tempo to hand the move to the opponent.
Zugzwang is when the obligation to move hurts you. Here it is Black to move: the king must leave c7, and the white king walks into b7 or b6 and wins the c6 pawn.
Now the same position with White to move. White cannot pass either: after Ka5 the black king simply waits on c7 and it is a draw. The way to hand the move back is a king manoeuvre. Find it.
This idea is called triangulation: the king draws a three-square triangle to lose a tempo, while the enemy king has no room to do the same. Once you recognise a zugzwang position, look for a way to hand the move to your opponent.