"Advanced" Topics

I came across some FL screenshots today that referred to certain kinks/practices this way -- as "advanced" topics, things you don't do until you've done other things first -- and it got me wondering. On the one hand, I can see how that'd make sense for things that scale pretty linearly... gotta learn how to tie a knot before you can learn how to do more complex/dangerous stuff that involves tying knots. But on the other hand, I'm not sure you can really quantify or draw a hard line between what is and isn't a special kind of risky. Anyway, right or wrong, are there any real-life kinks/playstyles/etc. that you think of as being on a different "level" of any kind? For context, this was from a discussion about warning newbies/inexperienced people away from certain things, specifically on the grounds of them being newbies.