The progression after Basic S-turn will be divided into skidded turns and carved turns, and in varied turn sizes.
Plus, edge change timing will be earlier and with added inputs of "pressuring" and "higher edge angle".
After basic S-turn, you will continue to work on the command over "edging", "pressuring" and "steering" of the snowboard. This will enable you to ride more difficult terrain, like steeper runs or bumpy runs.