First, keep all your body parts inside the cereal box...the board is the bottom of the box.
I've heard that a couple of times but I don't get that. I don't see how you can carve & bend your knees w/o shoving out your butt on heelside or putting knees over the edge when toeside. I see a few stickmen stiff as a board on the slope and I guess they fit inside the cereal box, but I just don't get it.
As for what really helped me out when learning was to transition onto the opposing edge before initiating the turn. Until I figured that out, turns were scary and I was going way too slow & not having fun, especially on the icy groomed runs of the East.