What Do You Consider An Advanced SW Feature

Features like extrude and revolve are pretty simple, whatwould you say is an advanced feature that is not a part of thespecialty areas like the sheet metal, mold, or surfacing tools?

Basically if you had to design an internal training course foradvanced users, what features would you concentrate on?

So far I have thought of:

Sweeps
Lofts
Belts & Chains

What would you want to learn about as an advanced user?SolidworksGeneral