For beginner skiers, learning to steer and eventually to turn on skis is important because it will allow you to remain in control of your direction and speed, let you steer around other people, and help you pick a path down the hill.
For skiers learning to turn, there are 2 stages to steering correctly, get tips on 'Steering Stage 1' from The Snow Centre's Instructors in the video below;
Once you've mastered stage 1, follow The Snow Centre's stage 2 tips for beginner steering on skis, or pick up some UK Lessons for further guidance.