… You got to subdivide collapse, and subdivide edges. The laugh lines example didn’t make sense to me.
That happens to us all. I suggest you try it for yourself first, try sculpting and try different settings, see how it feels and how it behaves. Then you can watch the lessons again and it'll probably make more sense. Also as you see other courses where sculpting is involved and you see other examples and approaches, things will start to click more. These things takes time, keep at it.