Starting a little below the top-center of your page, draw one long curved line that swings out to the left, dips down, and rounds back in toward the bottom — think of it like drawing a backwards letter C, but softened and rounded rather than sharp. Let the very top of this curve flatten out slightly rather than coming to a point, since that flattened top is where the stem will eventually sit, and let the bottom taper into a gentle curve rather than a straight edge. This one line already has the beginnings of an apple's personality — a little wider through the middle, narrower at both ends, and never perfectly symmetrical.