Learn how to deal with pawn tension and decide when to push, capture, or play elsewhere. If you can defend and attack simultaneously, that's often the best option. However, other times it's best to defend threats directly or even to ignore them and do something more important.
White was planning on castling, but Black just played ...Qb6, attacking the b2 pawn. Should White castle anyway or defend against Black's threat?
By ignoring Black's "threat," White can now trap Black's queen. Find the move!
Black's Queen is trapped.