The flight shape where the disc first banks towards your strong-hand side and then fades back to the weak side — for a right-handed backhand, right first, then left. That sequence is what produces maximum distance.
A disc does not fly in a straight line, it flies in two phases. While it is still fast, the turn shows — its tendency to bank towards your strong-hand side, so right for a right-handed backhand. As it slows, the fade takes over and pulls it back to the weak side, left in that case. That sequence draws an S on its side into the air, and it carries furthest, because the disc keeps working instead of bailing out early. Both phases sit on the disc as the manufacturer's flight numbers: a negative turn means plenty of bank, a high fade a hard finishing hook. The typical mistake is trying to force the S-curve with muscle. It comes from speed and a flat release — if your arm speed doesn't match the disc's speed rating, it fades out early and you only get the second half of the S. As a beginner you buy it with a slow, understable disc, not with a faster driver.