Steep truns and the FAA's 360 are different, as is the S turns versus clearing turns.
The 360 is a turn over a fixed point not alloing the aircraft to drift of the turning point. Example you are pivoting around house. When you commence the turn you are not allowed to gain or loose more than 50ft alt and your wing that that is pivoting the house is not allowed to drift closer or further from the house. On a windy day this can be a challenge.
S turns along a terrain feature are a similar thing. Lets pick a straight road as our feature. You commence the manouver 90 degrees to the road, as soon as you cross the road you begin a left or right hand turn. By the time you have turned 180 degrees you should be crossing back over the road. As soon as you make the second crossing you turn in the opposite direction. As soon as you have turned 180 in that direction you should be crossing the road again. It is not as easy at is sounds, esepcially on a windy day. It is all about judging the wind and the time of the turn. And it is a failure if you turn out of the 180 to early or too late. You must cross the road as the turn finishes.