I usually add a space, like this: #_ bbb so that I can easily move around and add/delete the #_. (I use Symex, which makes this extra convenient). (aaa #_bbb |ccc) (aaa #_ |bbb ccc)

https://countvajhula.com/2021/09/25/the-animated-guide-to-symex/

I think it should move to the next sexp (which is tautological, yeah). ccc is not a sexp so it’s not there. There’s no other sexp in the example so I dunno, I wouldn’t use the ‘next sexp’ operation on that.

ccc is absolutely an s-exp, it's what traditional lisp calls an atom, which qualifies as s-expression

https://en.wikipedia.org/wiki/S-expression

Oh okay. Didn’t know that atoms were sexps. Interesting. Thanks!