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There are a number of ways to turn, but one of the simplest is to lift one ski just off of the snow. This will turn your body in that direction. So if you want to turn to the left, slightly lift your left ski. If you want to turn right, slightly lift your right ski.  Also turn by twisting your hips in the direction you want to go. Twisting your hips will turn your skis in the direction you want to go. You can also try pushing down harder on the ski opposite to the direction you want to turn. To turn left, push down on the right-side ski, and the edges of your skis will turn you. The simplest stopping technique is the wedge or snowplow method. Turn the front tips of your skis so they are close together, and the back tips are far away from each other, a shape like a slice of pizza or a wedge. To stop completely, get the back of your skis as far apart as you can without having the front tips touching each other.  Point your toes toward each other gradually. If you point your toes together with a quick movement you are likely to throw off your balance. Practice stopping from slow speeds until you get the hang of it. How early you slow down depends on how long the hill is and how fast you are going. For small hills, you should slow down in the last 20 yards or so. On larger hills at higher speeds, look to slow down in the last 20% of the hill. Doing online research is great, but nothing beats having an instructor to give you specific instruction and feedback. Sign up for lessons before you get to the ski resort or ask about beginner classes when you arrive. You may have the option of group classes with other beginners or private lessons, which usually cost more.
Turn by lifting the ski on the side you want to turn toward. Stop by pointing your toes toward each other. Take a ski lesson.