On Wednesday, 17 Jan 2018 at 12:57, Ali M. wrote:
> What does starting a line or item with # mean to org-mode

From the manual:

    Lines starting with zero or more whitespace characters followed by
    one ‘#’ and a whitespace are treated as comments and, as such, are
    not exported.

HTH,
eric

-- 
Eric S Fraga via Emacs 27.0.50, Org release_9.1.6-39-gc82c21