I strongly disagree with tipping the knee. That puts your weight on soft tissue, including your medial collateral ligament in the knee. Keep the knee straight side-to-side for better knee health.
Works well to tip the ankles, especially the inside ankle, 'cuz that uses weaker muscle groups to tip the foot to the little toe edge, so always start with the side using the weaker muscles...the stronger muscles will easily keep up. Be sure to allow the hips to come across the skis to put the skis on edge (as shown at about 3:30 in the vid), and balance by angulation...tipping outward at the waist. I don't agree with "lean your body toward the slope;" more angulation and more counter (turning the hips toward the outside of the turn very early in the turn) results in better edge grip.
Putting 80% to 90% of the weight on the outside ski will cause it to bend more and turn tighter--lighten the inside ski to achieve this. Putting more pressure on the front of the ski will cause it to bend more and turn tighter. One should always be pressing against the boot tongue, and harder for tighter turns.
Notice his natural walking-width stance. Also notice that he has almost no tip lead. Tip lead in modern technique just causes back-seat balance and makes it harder to tip the skis on edge.