The next time you dive into a swimming pool try this; put your toes on the edge of the pool and stand tall, but with a little flex in your joints. Rock forward slowly, bending mostly at the ankles and play with that moment when you're actually too far over to stop. Think about that brief moment in time; you're falling but you're OK with it because you know what's coming next. Chances are you know that feeling already so you will recognize it when you work it into your skiing.....
This is an excellent description of what it feels like when you are maintaining a functional stance while skiing. You'll find this a "scary" feeling at first before your mind and body get used to it. Working to maintain this stance will give you more control over the front of the ski. You'll come to realize that this feeling gives you more control of the whole ski, and thus makes you more capable of putting to work what instructors tell you to do. You'll be able to get your skis take you where you want to go with precision. You paid a lot for the front half of your skis. Standing on them so that enough of your weight is hovering over the front means you will get your money's worth of performance out of those skis.
It takes a while, and deliberate practice, to convince your body and mind that this stance won't make you fall on your face. "Closing the ankles" and keeping them closed as you ski is the first step. This produces contact between the shin and tongue of the boot. Many skiers say to themselves "shin-tongue" to remind themselves to close those ankles as they are learning to do this. It's hard to remember at first, because there are so many things to pay conscious attention to as you learn to ski. But this "forward" stance thing should be at the top of your list. Pulling the feet backwards under the body helps with closing the ankles. Lifting the forefoot upward helps too, and keeps the heel seated properly on the boot footbed. Keeping your hands forward as if holding a cafeteria tray helps.
Staying on low pitch terrain as you work to embed this ankles-closed thing is very important, because if the terrain terrifies you, your brain and body won't let you close the ankles. Don't let friends take you to steep terrain before you are ready; you'll embed bad habits based on a back-seat stance and they will be the devil to get rid of later. If you feel fear, go back down to non-threatening terrain and work on making nice round, big, medium, and small turns with those ankles closed.
Adjustments of how
much of your body weight is hovering over the front of the skis can be made by flexing and extending at the knees and hips, without opening and closing the ankles. This too takes deliberate practice to learn to do. As you build your skills, you'll find by experimenting that in some snow conditions and on some terrain you'll want more weight over the front of the skis than at other times. But you won't want to open those ankles.
*Not all skiers believe this about keeping the ankles closed - there will be disagreement if this thread continues to generate posts.