Go Opening Theory

From the Wikipedia entry on 'Go Theory':

(Opening theory) is traditionally divided into the study of sequences that are whole board openings, and those that are corner openings....The Japanese word joseki (定石) (or Korean jungsuk) is often applied to such corner variations....The standard sequences for the corner plays in many cases come to a definite end, after which both players should move elsewhere.

As the saying goes, Don't learn joseki, learn from joseki..