Maximise the connectivity!

White 1 threatens Black's two framework links. How should Black respond?

Protecting the left link

Black 2 protects the left framework link but white 3 ensures the top link is broken. So Black must make his stones live independently. Black 4 threatens to connect and so makes some eye space whilst retaining the initiative. White 5 blocks and prepares for reducing the top left black territory. Black 6 is forced in order to ensure life. Although the stones can just live, the fact that Black will have to answer White defensively to maintain life together with the black 4, white 5 exchange means Black's stones are not the most efficient.

Protecting the top link

Black 2 protects the top link but white 3 ensures the left framework link is broken. Black 4 is necessary to ensure sufficient eye space for the now isolated bottom black stones to live. After white 5, black 6 is the most efficient move but you are a strong player if you can determine with confidence that the bottom black stones can still live.

Can you see a safer move that maintains both framework links?

Symmetry!

Black 2 enables the connection to both sides. White can depress the boundary slightly but a white stone played at any stage at A or B or at black 4 or 6 can be cut off. Although not necessarily intuitive, you may agree that finding this connection is considerably easier than working out the life and death ramifications caused by leaving isolated stones!