I think he meant the thing what I always call "let the board do the work". It's hard to explain theoretical, but I'll give it a try :)
So, as a beginner you really try to push your board in the direction you want to drive. You push your feed forwards/backwards to get your board where you want to.
However, it's really more about to try to lean your body in the curve and push your board to the ground accordingly.
To understand the concept it might help to follow this dry run. Just grab a board and place it on your favorite ground (no need to strap yourself onto the board, however).
Notice, that your board is wider at the tail and nose. To get what I try to explain, place it on one edge. You'll notice that it's a little bit off the ground in the middle. So, if you press the middle backwards and tilt the board a little bit, you can reach a point, where the edge of your board is fully connected to the ground. You'll see that your board is then curved in the direction you would normally want to drive. The board is "twisted" :)
If you practice this you'll get to a "wtf this isn't as exhausting as it used to be anymore"-point. That's the point where you've learned the concept.
That's a random picture from Google. However, it's nice to see what the person does. He leans into the curve and let his body push the board into the ground. The board is fully connected to the snow and does the turn automatically.
Another random picture, but you might be able to mention the board's "twisting".