Carving turns is a real asset to other turning methods. This technique can be used on its own and to boost other turning methods. Carved turns are especially useful when counteracting weather- or leecocking, or a slight tendency of stern-quarter winds to turn a kayak up- or downwind.
Since carved turns require you to edge your kayak, you should practice them on sheltered waters first.
When the kayak is edged, the curve of the hull is submerged, forcing the kayak to turn to the opposite side of the edging. The amount of edging you'll need varies from kayak to kayak.
To make your kayak edge, push one knee up against the underside of the foredeck while simultaneously weighting the opposite hip.
Edge the kayak while gliding, and try to hold the edge for as long as you can. To improve your balance, keep your eyes up, towards the horizon.