Skiing
Going from intermediate to advanced is to throw off the bad habits they taught you in skischool. The main offender; the snowplough.
This teaches you to stand up, to scrape/skid out your edges as a way of staying in control, to keep your weight between your skis, and to turn by u weighting from your uphill ski and weighting on your downhill ski. All of these are bad habits. You can get away with them on the piste. They will kill you in hard terrain.
ABT: Always be turning
Your skis are meant to be on an edge. That means you should always be in a turn. You control speed not by skidding out but by how much of the turning circle you engage in before exiting the turn. If on motorway, rocking gently side to side, if on hard terrain pulling linked semicircles but always turning. Turn with both skis: do not pick up that inside ski. Use it! This is a vestige of the turn as a last resort in moments of panic technique.
Hike out
It follows your centre of gravity almost never between your skis.
Bend ze knees;
Turn with both skis